Develop Reference

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.

NoClassDefFoundError: org/directwebremoting/extend/ConvertUtil

After moving a Tomcat app from one server to the other, we get this error:
SEVERE: Servlet.service() for servlet dwr-invoker threw exception
java.lang.NoClassDefFoundError: org/directwebremoting/extend/ConvertUtil
at org.directwebremoting.dwrp.CallBatch.parseParameters(CallBatch.java:135)
at org.directwebremoting.dwrp.CallBatch.<init>(CallBatch.java:47)
at org.directwebremoting.dwrp.BaseCallHandler.handle(BaseCallHandler.java:72)
at org.directwebremoting.servlet.UrlProcessor.handle(UrlProcessor.java:120)
at org.directwebremoting.servlet.DwrServlet.doPost(DwrServlet.java:141)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
We have the dwr.jar in the WEB-INF/lib dir (and I opened it and checked, the org/directwebremoting/extend/ConvertUtil is there)
/srv/tomcat6/webapps/APPNAME/WEB-INF/lib/dwr.jar
UPDATE this is how DWR dependency is defined in the pom.xml
<dependency>
<groupId>org.directwebremoting</groupId>
<artifactId>dwr</artifactId>
<version>3.rc1</version>
<scope>system</scope>
<systemPath>${basedir}/src/main/webapp/WEB-INF/lib/dwr.jar</systemPath>
</dependency>

JSP 2.3 with Tomcat 8

I am trying to move from Tomcat 7 to Tomcat 8. I use maven as build tool.
From Tomcat 8 Maven Plugin for Java 8 I see that it is possible to use tomcat7-maven-plugin with Tomcat8. However, the issue here is Jasper complaints of an invalid JSP version when it should not actually.
pom.xml
<dependency>
<groupId>javax.faces</groupId>
<artifactId>jsf-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>javax.servlet.jsp-api</artifactId>
<version>2.3.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.el</groupId>
<artifactId>javax.el-api</artifactId>
<version>3.0.0</version>
<scope>provided</scope>
</dependency>
...
...
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
</plugin>
The error I get is
Jan 22, 2016 2:54:55 AM org.apache.jasper.compiler.TldLocationsCache tldScanJar
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
Jan 22, 2016 2:54:55 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [jsp] in context with path [/push] threw exception [/index.jsp (line: 7, column: 66) Invalid version number: "2.3", must be "1.2", "2.0", "2.1" or "2.2"] with root cause
org.apache.jasper.JasperException: /index.jsp (line: 7, column: 66) Invalid version number: "2.3", must be "1.2", "2.0", "2.1" or "2.2"
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:443)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:149)
at org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:526)
at org.apache.jasper.compiler.Node$JspRoot.accept(Node.java:564)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2375)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2427)
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2433)
at org.apache.jasper.compiler.Node$Root.accept(Node.java:474)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2375)
at org.apache.jasper.compiler.Validator.validateExDirectives(Validator.java:1798)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:217)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:373)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:646)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Since Tomcat 8 uses Jasper 2 to implement JSF 2.3 and from the below code for Jasper 2:-
public void visit(Node.JspRoot n) throws JasperException {
JspUtil.checkAttributes(TagConstants.ROOT_ACTION, n, jspRootAttrs, err);
String version = n.getTextAttribute("version");
if (!version.equals("1.2") && !version.equals("2.0") &&
!version.equals("2.1") && !version.equals("2.2") &&
!version.equals("2.3")) {
err.jspError(n, MESSAGES.invalidJspVersionNumber(version));
}
visitBody(n);
}
I suspect that the version of Jasper may not be the right one getting referenced causing the error, but I do not have a way to assess that. Any leads are appreciated!

This is an issue with tomcat7-maven-plugin which has support for just Tomcat 7 at the moment. There are recommendations on adjusting the embedded tomcat version at
http://tomcat.apache.org/maven-plugin-trunk/tomcat7-maven-plugin/adjust-embedded-tomcat-version.html. However, it causes issue as described at-
https://issues.apache.org/jira/browse/MTOMCAT-234
At the time of writing this, it still stands unresolved. I am considering to shift my entire project to Gradle for good, given that gradle-tomcat-plugin supports Tomcat 8.

Tomcat Exception : HTTP Status 500

I am just trying to get started with Spring.Downloaded STS for Eclipse.Created a Spring MVC Template project.But when I run the helloworld web app,I get the following error message in my browser:
`message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /WEB-INF/views/home.jsp(1,63) Unable to read TLD "META-INF/c.tld" from JAR file "file:/usr/local/development/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/MySpringHelloWorld/WEB-INF/lib/jstl-1.2.jar": org.apache.jasper.JasperException: Failed to load or instantiate TagLibraryValidator class: org.apache.taglibs.standard.tlv.JstlCoreTLV
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:218)
org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:183)
org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:386)
org.apache.jasper.compiler.Parser.parseDirective(Parser.java:450)
org.apache.jasper.compiler.Parser.parseElements(Parser.java:1397)
org.apache.jasper.compiler.Parser.parse(Parser.java:130)
org.apache.jasper.compiler.ParserController.doParse(ParserController.java:255)
org.apache.jasper.compiler.ParserController.parse(ParserController.java:103)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:185)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:347)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:592)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:326)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1180)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:950)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
Could somebody point what I'm missing?

Commenting the dependency
javax.servlet.jsp jsp-api
generated in pom.xml solved the problem for me.

Try adding this maven dependency in pom.xml
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-jasper</artifactId>
<version>7.0.2</version>
</dependency>

Error message when installing new tomcat server (5.5)

I have installed a new tomcat server (5.5) and I get this exception:
org.apache.jasper.JasperException: Unable to load tag handler class "org.apache.taglibs.standard.tag.rt.core.WhenTag" for tag "c:when"
I guess I am missing the JSTL but I can't find how do add it to the tomcat server.
i found jstl-api-1.2.jar and jstl-impl-1.2.jar here
i have put them in the WEB-INF/lib
and now i get this exception
org.apache.jasper.JasperException: Unable to compile class for JSP:
An error occurred at line: 29 in the jsp file: /jsp/general/pos/DoMultiWordFrozen.jspf
Type mismatch: cannot convert from Boolean to boolean
the same code was working on my old (tomcat 5.5.12) server.

#yossi, yes you are missing JSTL taglib.
download JSTL 1.1/jstl.jar and standard.jar to WEB-INF/lib Folder.
If you are using Maven in your project you can add below dependency to your pom.xml
<!-- standard.jar -->
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.0</version>
</dependency>
<!-- JSTL -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.1.0</version>
</dependency>
You can find out more Maven releases here

You can add jstl.jar into web application, just copy jstl.jar to WEB-INF/lib.