Develop Reference

CassandraDataSource JDBC as a datasource

I've used the Apache DBUtils library in my Java application, initially written in MySQL. I'm looking at changing the database to Cassandra. The only way I can run queries on it is to use a basic data source.
I've got the Datagrip fork of the DBSchema library, available here:
https://dbschema.com/jdbc-driver/Cassandra.html
I've tried "twig", a cassandra JDBC driver but it's nowhere near complete.
I can't use the datastax driver as (AFAIK) it doesn't support data sources.
If I can't resolve this it's a full rewrite.
Here's my code, where am I going wrong?
import com.github.cassandra.jdbc.CassandraDriver;
import org.apache.commons.dbcp2.BasicDataSource;
import javax.sql.DataSource;
public class CustomDataSource {
CassandraDriver cs = new CassandraDriver();
final String DB_URL = "jdbc:cassandra://localhost:9160/queuie";
final String JDBC_DRIVER = "com.github.cassandra.jdbcx.CassandraDataSource";
private final BasicDataSource basicDataSource;
The error message I'm getting is:
java.sql.SQLException:
Cannot load JDBC driver class 'com.github.cassandra.jdbcx.CassandraDriver'
at org.apache.commons.dbcp2.DriverFactory.createDriver(DriverFactory.java:54)
at org.apache.commons.dbcp2.BasicDataSource.createConnectionFactory(BasicDataSource.java:472)
at org.apache.commons.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:538)
at org.apache.commons.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:753)
at org.apache.commons.dbutils.AbstractQueryRunner.prepareConnection(AbstractQueryRunner.java:319)
at org.apache.commons.dbutils.QueryRunner.query(QueryRunner.java:327)
at DoLogin.doPost(DoLogin.java:534)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:71)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:834) Caused by: java.lang.ClassNotFoundException: com.github.cassandra.jdbcx.CassandraDriver
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1363)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1186)
at org.apache.commons.dbcp2.DriverFactory.createDriver(DriverFactory.java:49) ... 33 more java.sql.SQLException: Cannot load JDBC driver class 'com.github.cassandra.jdbcx.CassandraDriver'
at org.apache.commons.dbcp2.DriverFactory.createDriver(DriverFactory.java:54)
at org.apache.commons.dbcp2.BasicDataSource.createConnectionFactory(BasicDataSource.java:472)
at org.apache.commons.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:538)
at org.apache.commons.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:753)
at org.apache.commons.dbutils.AbstractQueryRunner.prepareConnection(AbstractQueryRunner.java:319)
at org.apache.commons.dbutils.QueryRunner.query(QueryRunner.java:327)
at DoLogin.doPost(DoLogin.java:534)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:71)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:834) Caused by: java.lang.ClassNotFoundException: com.github.cassandra.jdbcx.CassandraDriver
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1363)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1186)
at org.apache.commons.dbcp2.DriverFactory.createDriver(DriverFactory.java:49) ... 33 more
EDIT: I just realised I'm not resolving the com.dbschema package, It's installed as a local file by Maven using mvn install, any ideas?

Anyone succesfully used Wss4jSecurityInterceptor for Spring.WS for SAML security with a SAMLCallbackHandler in a Spring Boot application?

Is someone with experience in using Wss4jSecurityInterceptor able to help figuring out if we are doing something wrong regarding a SAMLCallbackHandler for supplying the assertion for the security header of a SOAP call?
Specifically: org.springframework.ws.soap.security.wss4j2.Wss4jSecurityInterceptor
Context:
We are building a service bus using Spring Boot + Spring Integration, which needs to be able to consume and produce requests signed with SAML, not in the context of SSO. We have picked Wss4jSecurityInterceptor for validating and signing the SOAP requests with SAML. We are applying the interceptor directly to Spring Webservices and not relying on Spring Integration.
We are currently having problems during signing. We have validation and signatures working but no assertion is applied to outgoing messages. This requires us to use the securement action “SAMLTokenSigned” which requires a CallbackHandler for the interceptor (a SAMLCallbackHandler).
This far we have not been able to find existing implementations or good examples of such a SAMLCallbackHandler. What we have found have been lackluster and lead us onto a long road of “guessing” what the handler is missing through debugging. At this point it seems like we are heading down the wrong road, and that we are missing something. It is not exactly novel work that we are doing.
Setup of the Wss4jSecurityInterceptor looks like shown below.
#Bean
public Wss4jSecurityInterceptor wss4jSecurityInterceptor(){
Wss4jSecurityInterceptor interceptor = new Wss4jSecurityInterceptor();
// The action SAMLTokenSigned requires us to use SAMLCallbackk
interceptor.setSecurementActions("Signature SAMLTokenSigned");
interceptor.setSecurementSignatureCrypto(keystoreCrypto());
interceptor.setSecurementUsername("client");
interceptor.setSecurementPassword("password");
interceptor.setSecurementSignatureDigestAlgorithm("http://www.w3.org/2007/05/xmldsig-more#sha3-256");
interceptor.setSecurementSignatureAlgorithm("http://www.w3.org/2009/xmldsig11#dsa-sha256");
SAML2CallbackHandler saml2CallbackHandler = new SAML2CallbackHandler(); // implements CallbackHandler
saml2CallbackHandler.crypto = keystoreCrypto(); // using the same keystore for the issuer
interceptor.setSecurementSamlCallbackHandler(saml2CallbackHandler);
// we ignore validationActions for now. e.g. interceptor.setValidationActions("Signature");
return interceptor;
}
public Crypto keystoreCrypto(){
CryptoFactoryBean cryptoFactoryBean = new CryptoFactoryBean();
try{
cryptoFactoryBean.setKeyStoreLocation( new ClassPathResource("saml-keystore.jks"));
cryptoFactoryBean.setKeyStorePassword("password");
return cryptoFactoryBean.getObject();
}
catch(Exception e){}
return null;
}
Our SAML2Callback handler is heavily inspired by https://github.com/jaminh/spring-saml-example-war/blob/master/src/test/java/org/apache/ws/security/common/SAML2CallbackHandler.java but we had to deal with libraries we could not find on maven-repositories, which gave a series of small issues.
I can provide our version upon request, but it is somewhat of a mess.
While I do not expect it to provide much, here is the Stacktrace for the exception that is thrown for the code at the point of writing:
Original Exception was org.apache.wss4j.common.ext.WSSecurityException: No certificates were found for SAML signature
at org.springframework.ws.soap.security.wss4j2.Wss4jSecurityInterceptor.secureMessage(Wss4jSecurityInterceptor.java:577) ~[spring-ws-security-3.0.9.RELEASE.jar:na]
at org.springframework.ws.soap.security.AbstractWsSecurityInterceptor.handleResponse(AbstractWsSecurityInterceptor.java:157) ~[spring-ws-security-3.0.9.RELEASE.jar:na]
at org.springframework.ws.server.MessageDispatcher.triggerHandleResponse(MessageDispatcher.java:371) ~[spring-ws-core-3.0.8.RELEASE.jar:na]
at org.springframework.ws.server.MessageDispatcher.dispatch(MessageDispatcher.java:239) ~[spring-ws-core-3.0.8.RELEASE.jar:na]
at org.springframework.ws.server.MessageDispatcher.receive(MessageDispatcher.java:176) ~[spring-ws-core-3.0.8.RELEASE.jar:na]
at org.springframework.ws.transport.support.WebServiceMessageReceiverObjectSupport.handleConnection(WebServiceMessageReceiverObjectSupport.java:89) ~[spring-ws-core-3.0.8.RELEASE.jar:na]
at org.springframework.ws.transport.http.WebServiceMessageReceiverHandlerAdapter.handle(WebServiceMessageReceiverHandlerAdapter.java:61) ~[spring-ws-core-3.0.8.RELEASE.jar:na]
at org.springframework.ws.transport.http.MessageDispatcherServlet.doService(MessageDispatcherServlet.java:293) ~[spring-ws-core-3.0.8.RELEASE.jar:na]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:660) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
Caused by: org.apache.wss4j.common.ext.WSSecurityException: Error when signing the SAML token:
at org.apache.wss4j.dom.action.SAMLTokenSignedAction.execute(SAMLTokenSignedAction.java:133) ~[wss4j-ws-security-dom-2.2.3.jar:2.2.3]
at org.apache.wss4j.dom.handler.WSHandler.doSenderAction(WSHandler.java:238) ~[wss4j-ws-security-dom-2.2.3.jar:2.2.3]
at org.springframework.ws.soap.security.wss4j2.Wss4jHandler.doSenderAction(Wss4jHandler.java:63) ~[spring-ws-security-3.0.9.RELEASE.jar:na]
at org.springframework.ws.soap.security.wss4j2.Wss4jSecurityInterceptor.secureMessage(Wss4jSecurityInterceptor.java:574) ~[spring-ws-security-3.0.9.RELEASE.jar:na]
... 45 common frames omitted
Caused by: org.apache.wss4j.common.ext.WSSecurityException: No certificates were found for SAML signature
at org.apache.wss4j.dom.saml.WSSecSignatureSAML.prepare(WSSecSignatureSAML.java:258) ~[wss4j-ws-security-dom-2.2.3.jar:2.2.3]
at org.apache.wss4j.dom.saml.WSSecSignatureSAML.build(WSSecSignatureSAML.java:110) ~[wss4j-ws-security-dom-2.2.3.jar:2.2.3]
at org.apache.wss4j.dom.action.SAMLTokenSignedAction.execute(SAMLTokenSignedAction.java:125) ~[wss4j-ws-security-dom-2.2.3.jar:2.2.3]
... 48 common frames omitted
The same expectation for information about keystore, but maybe it could be relevant:
Generated with keytool (I do not recall the command unfortunately)
Public Key type and size: DSA 2048 bits Signature Algorithm:
SHA256WITHDSA Fingerprint SHA-1
37:E8:E0:B7:DD:7E:7A:33:43:F8:9D:06:6D:20:1E:BE:B7:63:3A:B9

UnsatisfiedLinkError when try to use google or-tools with spring

i need to write simple TSP-solver service for my project
or-tools solver works with simple static main class, but when i try to include it as service in spring i get
java.lang.UnsatisfiedLinkError: 'void com.google.ortools.constraintsolver.mainJNI.swig_module_init()'
public class TravelingSalesmanExample2 {
public static void main(String[] args) {
System.loadLibrary("jniortools");
...
works perfect, but when i try to call methods from or-tools within spring poject as #Service or even like this
#SpringBootApplication
public class Application {
public static void main(String[] args) throws IOException {
SpringApplication.run(Application.class, args);
TravelingSalesmanExample2.main(null);
}
}
i have this error
java.lang.UnsatisfiedLinkError: 'void com.google.ortools.constraintsolver.mainJNI.swig_module_init()'
at com.google.ortools.constraintsolver.mainJNI.swig_module_init(Native Method) ~[com.google.ortools.jar:na]
at com.google.ortools.constraintsolver.mainJNI.<clinit>(mainJNI.java:2393) ~[com.google.ortools.jar:na]
at com.google.ortools.constraintsolver.RoutingIndexManager.<init>(RoutingIndexManager.java:46) ~[com.google.ortools.jar:na]
at com.genii.pathfinder.service.TravelingSalesmanService.sortInOptimalRoute(TravelingSalesmanService.java:24) ~[classes/:na]
at com.genii.pathfinder.controller.Api.testOrGoogle(Api.kt:41) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:567) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at java.base/java.lang.Thread.run(Thread.java:830) ~[na:na]
I have tried add or-tool as maven dependency as described here https://github.com/oliviercailloux/google-or-tools-java
tried add argument -Djava.library.path=/Users/vitaliy/Desktop/backend/lib
tried load as System.load("/Users/vitaliy/Desktop/backend/lib/libjniortools.jnilib");
but not succeed. any idea how to make native libs visible for spring-served application?
UPD OS: mac os catalina 10.15.3

Check out my answer here, I'm using google or-tools as a part of a spring-boot application over intellij.

#SpringBootApplication
public class Application {
static{
System.loadLibrary("jniortools");
}
public static void main(String[] args) throws IOException {
SpringApplication.run(Application.class, args);
TravelingSalesmanExample2.main(null);
}
}

Axon Framework: How to use state-stored aggregates

I am using spring boot with Axon 4.2.
I tried to use the state stored aggregates, I tried two ways but none non of them worked.
1., I tried exactly as you wrote here: https://docs.axoniq.io/reference-guide/implementing-domain-logic/command-handling/state-stored-aggregates
My code:
#Getter
#Setter
#NoArgsConstructor
#Entity
#Table(name = "szervezet")
public class Organization {
#Id
#Column(columnDefinition = "serial", name = "szervezet_azon")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#AggregateIdentifier
#Column(name = "aggregate_azon")
private String aggregateId;
#NotEmpty
#Column(name = "szervezet_nev")
private String organizationName;
#CommandHandler
public Organization(CreateOrganizationCommand command){
System.err.println("CommandHandler");
AggregateLifecycle.apply(new OrganizationCreatedEvent(command));
}
#EventHandler
protected void on(OrganizationCreatedEvent event){
this.id=event.getId();
this.aggregateId=event.getAggregateId();
this.organizationName=event.getOrganizationName();
System.err.println("Eventhandler");
}
}
After i try to run it i got the following exception list:
org.axonframework.commandhandling.NoHandlerForCommandException: No handler was subscribed to command [hu.enak.recordrequestingcaseservice.command.CreateOrganizationCommand]
at org.axonframework.commandhandling.SimpleCommandBus.doDispatch(SimpleCommandBus.java:146) ~[axon-messaging-4.2.jar:4.2]
at org.axonframework.commandhandling.SimpleCommandBus.dispatch(SimpleCommandBus.java:111) ~[axon-messaging-4.2.jar:4.2]
at org.axonframework.commandhandling.gateway.AbstractCommandGateway.send(AbstractCommandGateway.java:75) ~[axon-messaging-4.2.jar:4.2]
at org.axonframework.commandhandling.gateway.DefaultCommandGateway.send(DefaultCommandGateway.java:73) ~[axon-messaging-4.2.jar:4.2]
at org.axonframework.commandhandling.gateway.DefaultCommandGateway.sendAndWait(DefaultCommandGateway.java:90) ~[axon-messaging-4.2.jar:4.2]
at hu.enak.recordrequestingcaseservice.gateway.service.impl.OrganizationGatewayServiceImpl.createOrganization(OrganizationGatewayServiceImpl.java:17) ~[classes/:na]
at hu.enak.recordrequestingcaseservice.controller.query.CaseQueryController.axon(CaseQueryController.java:124) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
at org.apache.cxf.service.invoker.AbstractInvoker.performInvocation(AbstractInvoker.java:179) ~[cxf-core-3.3.3.jar:3.3.3]
at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:96) ~[cxf-core-3.3.3.jar:3.3.3]
at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:201) ~[cxf-rt-frontend-jaxrs-3.3.3.jar:3.3.3]
at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:104) ~[cxf-rt-frontend-jaxrs-3.3.3.jar:3.3.3]
at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:59) ~[cxf-core-3.3.3.jar:3.3.3]
at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:96) ~[cxf-core-3.3.3.jar:3.3.3]
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:308) ~[cxf-core-3.3.3.jar:3.3.3]
at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121) ~[cxf-core-3.3.3.jar:3.3.3]
at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:267) ~[cxf-rt-transports-http-3.3.3.jar:3.3.3]
at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:234) ~[cxf-rt-transports-http-3.3.3.jar:3.3.3]
at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:208) ~[cxf-rt-transports-http-3.3.3.jar:3.3.3]
at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:160) ~[cxf-rt-transports-http-3.3.3.jar:3.3.3]
at org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:216) ~[cxf-rt-transports-http-3.3.3.jar:3.3.3]
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:301) ~[cxf-rt-transports-http-3.3.3.jar:3.3.3]
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doGet(AbstractHTTPServlet.java:225) ~[cxf-rt-transports-http-3.3.3.jar:3.3.3]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:276) ~[cxf-rt-transports-http-3.3.3.jar:3.3.3]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:96) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
I dont know why because there is the #CommandHandler. I think its because the #Aggregate annotation is missing, but when i try to put on this and this is the second option i get the following compiler error:
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-11-15 10:04:15.199 ERROR 6416 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
The bean 'organizationRepository', defined in null, could not be registered. A bean with that name has already been defined in null and overriding is disabled.
Action:
Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true
What am I doing wrong?
Thanks

If you wish to use a class as an Axon aggregate, you need to annotate it with #Aggregate. In your code, there is no such annotation, causing Axon to not use that class as a command handler.
Axon will also make a Repository for your aggregate, called Repository. It seems from the logs that you already have a repository named that way. They will conflict. You're probably best off renaming the other repository bean, or renaming the Aggregate (which you can do in the #Aggregate annotation).

getForEntity returns null

I try to write java service using spring boot. Here is the my code. The thing is I am getting null all the time. Where is the missing part in my code ?
#RestController
public class CurrencyConversionController {
#GetMapping("/currency-converter/from/{from}/to/{to}/quantity/{quantity}")
public CurrencyConversionBean convertCurrency(#PathVariable String from,
#PathVariable String to,
#PathVariable BigDecimal quantity){
Map<String,String> uriVariables = new HashMap<>();
uriVariables.put("from",from);
uriVariables.put("to",to);
ResponseEntity<CurrencyConversionBean> responseEntity = new RestTemplate().
getForEntity("http://localhost:8000/currency-exchange/from/{from}/to/{to}",
CurrencyConversionBean.class,
uriVariables);
CurrencyConversionBean response = responseEntity.getBody();
return new CurrencyConversionBean(response.getId(),from,to,response.getConvertionMultiple(),quantity,
quantity.multiply(response.getConvertionMultiple()),
response.getPort());
}
}
Here is the error I got;
rror on GET request for "http://localhost:8888/currency-conversion-service/default": Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect
com.example.currencyconversionservice.CurrencyConversionBean#333fa33b****************************
null---------------------------------
2019-11-12 11:43:26.506 ERROR 3008 --- [nio-8100-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException: null
at java.base/java.math.BigDecimal.multiply(BigDecimal.java:1512) ~[na:na]
at com.example.currencyconversionservice.CurrencyConversionController.convertCurrency(CurrencyConversionController.java:35) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:888) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:108) ~[spring-boot-actuator-2.2.1.RELEASE.jar:2.2.1.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1579) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
com.example.currencyconversionservice.CurrencyConversionBean#43bfd139****************************
null---------------------------------
As the error states it gives null pointer exception. I am following udemy course. This code from this course.
This is my first java service application and I could not figure out the problem. Any help is appreciated. Thank you.

I think that
response.getConvertionMultiple() == null
that why you have java.base/java.math.BigDecimal.multiply(BigDecimal.java:1512) in your stackTrace, it's happened when you trying to multiply "quantity" by your "response.getConvertionMultiple()" which is null.
So clearly you have to check if (response.getConvertionMultiple() == null) // do something.

Does Java even have String interpolation?
Change the getforEntity line:
getForEntity("http://localhost:8000/currency-exchange/from/"+from+"/to/"+to)

It may be bit late for reply, But might be useful for someone hopefully.
Here output of currency-exchange is not able to map to CurrencyConversionBean,
ResponseEntity<CurrencyConversionBean> responseEntity = new RestTemplate().
getForEntity("http://localhost:8000/currency-exchange/from/{from}/to/{to}",
CurrencyConversionBean.class,
uriVariables);
Solution here can be, check bean variables fro both mocroservices, it must be same in order to map its output to CurrencyConversionBean. hopefully this helps.