Develop Reference

servlet.service error, classNotFoundException

I am done building the java spring boot app and now I am trying to deploy it to VPS. Everything works except once I access part of web app that is connected to the database I get this error
ERROR 7379 --- [nio-8080-exec-5] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Handler dispatch failed; nested exception is java.lang.ExceptionInInitializerError] with root cause
When I put connection url to database to be jdbc:mysql://"ip of server":3306/kuponi i get this error
and when I put connection url to database to be jdbc:mysql://localhost:3306/kuponi

Try adding these dependencies to your pom.xml file
<dependency>
<groupId>jakarta.xml.bind</groupId>
<artifactId>jakarta.xml.bind-api</artifactId>
<version>2.3.3</version>
</dependency>
<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-ri</artifactId>
<version>2.3.3</version>
</dependency>

Maven throwing SAML Statement error message

I am working on Maven and I get error as shown below. I tried checking deployment assembly and build path but I am not getting any hint on what the system is complaining about. I also made sure I cleaned tomcat directory and cleaned the project. I would appreciate any help on it
Jan 20, 2020 12:11:13 PM org.apache.catalina.core.StandardWrapperValve
invoke SEVERE: Servlet.service() for servlet [cas] in context with
path [/URL] threw exception [Request processing failed; nested
exception is
org.springframework.webflow.execution.ActionExecutionException:
Exception thrown executing
org.springframework.webflow.action.ViewFactoryActionAdapter#2def1006
in state 'viewServiceErrorView' of flow 'login' -- action execution
attributes were 'map[[empty]]'] with root cause
java.lang.ClassNotFoundException: org.opensaml.SAMLStatement at
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1305)
at
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1139)
at java.lang.Class.getDeclaredConstructors0(Native Method) at
java.lang.Class.privateGetDeclaredConstructors(Class.java:2671) at
java.lang.Class.getConstructor0(Class.java:3075) at
java.lang.Class.getDeclaredConstructor(Class.java:2178) at
org.springframework.beans.factory.support.SimpleInstantiationStrategy.

As the system was complaining I was missing opensaml jar.
<dependency>
<groupId>org.opensaml</groupId>
<artifactId>opensaml</artifactId>
<version>1.1</version>
</dependency>
System was unable to download the jar from maven repo. I manually updated the jar in my local and it worked fine.

jsp 3, jstl 1.2 and maven

I use: java 10, Tomcat 7.0.88 with maven
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
In this case I recipes following exception
HTTP Status 500 - The absolute uri: http://java.sun.com/jsp/jstl/core
cannot be resolved in either web.xml or the jar files deployed with
this application
type Exception report
message The absolute uri: http://java.sun.com/jsp/jstl/core cannot be
resolved in either web.xml or the jar files deployed with this
application
description The server encountered an internal error that prevented it
from fulfilling this request.
exception
org.apache.jasper.JasperException: The absolute uri:
http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml
or the jar files deployed with this application
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:56)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:445)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:117)
org.apache.jasper.compiler.TagLibraryInfoImpl.generateTLDLocation(TagLibraryInfoImpl.java:325)
org.apache.jasper.compiler.TagLibraryInfoImpl.(TagLibraryInfoImpl.java:154)
org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:419)
org.apache.jasper.compiler.Parser.parseDirective(Parser.java:484)
org.apache.jasper.compiler.Parser.parseElements(Parser.java:1421)
org.apache.jasper.compiler.Parser.parse(Parser.java:138)
org.apache.jasper.compiler.ParserController.doParse(ParserController.java:242)
org.apache.jasper.compiler.ParserController.parse(ParserController.java:102)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:199)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:374)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:354)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:341)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:660)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:364)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
todo.TodoServlet.doGet(TodoServlet.java:23)
javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache
Tomcat/7.0.88 logs. Apache Tomcat/7.0.88

EJB ETL NoClassDefFoundError: org.apache.poi.util.SAXHelper during runtime

Root pom has the following dependencies,
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.16</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.16</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>3.16</version>
</dependency>
But during runtime, during etl process following error occurs,
EJB threw an unexpected (non-declared) exception during invocation of method "****" on bean "BeanId(***-ear#***-ejb.jar#***ServiceImpl, null)". Exception data: java.lang.NoClassDefFoundError: org.apache.poi.util.SAXHelper
Root cause is NoClassDefFoundError in the following code snippet,
XMLReader parser = SAXHelper.newXMLReader();
Environment used,
JDK 1.6.0_35
Websphere Application Server v8.0
Eclipse Juno Service Release 2
Full stack trace can be found here
Caused by: java.lang.ClassNotFoundException: org.apache.poi.util.SAXHelper
at java.net.URLClassLoader.findClass(URLClassLoader.java:434)
at com.ibm.ws.bootstrap.ExtClassLoader.findClass(ExtClassLoader.java:230)
at java.lang.ClassLoader.loadClassHelper(ClassLoader.java:703)
at java.lang.ClassLoader.loadClass(ClassLoader.java:682)
at com.ibm.ws.bootstrap.ExtClassLoader.loadClass(ExtClassLoader.java:123)
at java.lang.ClassLoader.loadClass(ClassLoader.java:665)
at com.ibm.ws.classloader.ProtectionClassLoader.loadClass(ProtectionClassLoader.java:62)
at com.ibm.ws.classloader.ProtectionClassLoader.loadClass(ProtectionClassLoader.java:58)
at com.ibm.ws.classloader.CompoundClassLoader.loadClass(CompoundClassLoader.java:566)
at java.lang.ClassLoader.loadClass(ClassLoader.java:665)
... 87 more
note: I have opened the ear archive and found the respective jars available. Checked Eclipse java build path also. Everything seems to be fine.
Thanks.

SAXHelper is in poi-ooxml-3.16.jar. I suspect that one of the static initializers in this class is failing.
https://github.com/apache/poi/blob/trunk/src/ooxml/java/org/apache/poi/util/SAXHelper.java

Servlet error when changing JAR from compile to provided

I am currently trying to move a JAR from a deployed WAR to just being included in the Tomcat library. Here's the dependency in my pom.xml
<dependency>
<groupId>psft.pt8</groupId>
<artifactId>psjoa</artifactId>
<version>8.54.22</version>
<type>jar</type>
<scope>provided</scope>
</dependency>
When scope is <scope>compile</scope> everything works fine. I build the artifact, deploy it in Tomcat, and can access the WSDL. When I change scope to provided, I can still build the artifact, deploy it in Tomcat, it LOOKS like it's fine, but then when attempting to go to the WSDL I reach this error.
The server encountered an internal error that prevented it from fulfilling this request: Servlet.init() for servlet spring-ws threw exception
javax.servlet.ServletException: Servlet.init() for servlet spring-ws threw exception
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
psiprobe.Tomcat80AgentValve.invoke(Tomcat80AgentValve.java:45)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:676)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1099)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:670)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Thread.java:745)
Not sure where to begin.

Solution 1.
If you don't want including artifact psft.pt8:psjoa:8.54.22 inside WAR generated artifact
use <scope>provided</scope> in pom.xml
put psft.pt8:psjoa:8.54.22 JAR file inside $CATALINA_HOME\lib (on macOS, Linux) or %CATALINA_HOME%\lib (on Windows operating system).
Solution 2.
If you want including artifact psft.pt8:psjoa:8.54.22 inside WAR generated artifact, use <scope>compile</scope> in pom.xml.