Develop Reference

How to debug java.lang.ClassNotFoundException during Tomcat startup?

When Tomcat loads my war, I get this error:
Exception in thread "ClientMessageReceptor0" java.lang.NoClassDefFoundError: java/net/Inet6Address
at org.jacorb.orb.iiop.IIOPAddress.getNetworkInetAddresses(IIOPAddress.java:675)
at org.jacorb.orb.iiop.IIOPAddress.getLocalHost(IIOPAddress.java:591)
at org.jacorb.orb.iiop.IIOPAddress.getLocalHostAddress(IIOPAddress.java:574)
at org.jacorb.orb.listener.SSLListenerUtil.processException(SSLListenerUtil.java:73)
at org.jacorb.orb.iiop.IIOPConnection.handleCommFailure(IIOPConnection.java:77)
at org.jacorb.orb.etf.StreamConnectionBase.read(StreamConnectionBase.java:139)
at org.jacorb.orb.giop.GIOPConnection.getMessage(GIOPConnection.java:389)
at org.jacorb.orb.giop.GIOPConnection.receiveMessagesLoop(GIOPConnection.java:541)
at org.jacorb.orb.giop.GIOPConnection.receiveMessages(GIOPConnection.java:533)
at org.jacorb.orb.giop.MessageReceptor.doWork(MessageReceptor.java:69)
at org.jacorb.util.threadpool.ConsumerTie.run(ConsumerTie.java:60)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: Illegal access: this web application instance has been stopped already. Could not load [java.net.Inet6Address]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1375)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1226)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1188)
Our application uses Tomcat v9.0.41 and JDK 1.8.0_111 . This same combination works for others in my team and also it worked for me sometime back. I'm not sure what changed now. I have looked at other similar posts and they suggest mismatch between Tomcat and JDK version. But above combination of Tomcat and JDK works for others.
I have removed all other JDK and JRE version on my system.
Ensured JAVA_HOME points to JDK 1.8.0_111 and PATH points to correct JRE.
Any pointers on how to debug this further? Can I turn on some logging during Tomcat startup to see what paths are being used by Tomcat? Any suggestions are highly appreciated :).

Where is the cause of: Error Connecting to Glassfish Server?

I'm running into the following error when trying to deploy to Glassfish from IntellIJ IDEA, but I can't work out where to look first to find the issue.
Error running 'Glassfish Dev'
Error Connecting to Glassfish Server.
Exception occurred : java.lang.NullPointerException
Exception message : null
This is Glassfish 3.1, the configuration used to work but has recently stopped, I can't work out if the issue should be investigated within the Glassfish server or the local project + config.

POI 3.17 is not working on weblogic server

Good day,
I tried to use POI in my application to load excel sheet.
everything is working fine on local tomcat but when I move it to server WebLogic 12.2 that run on Java 8, I got an error as follow.
I tried all versions from POI 3.8 to 3.17(latest) but none of them is working correctly on the server.
Error checking for java lib
java.lang.ExceptionInInitializerError
at org.apache.poi.openxml4j.opc.OPCPackage.init(OPCPackage.java:161)
at org.apache.poi.openxml4j.opc.OPCPackage.(OPCPackage.java:141)
at org.apache.poi.openxml4j.opc.ZipPackage.(ZipPackage.java:97)
at org.apache.poi.openxml4j.opc.OPCPackage.open(OPCPackage.java:324)
at org.apache.poi.util.PackageHelper.open(PackageHelper.java:37)
Truncated. see log file for complete stacktrace
Caused By: java.lang.ClassCastException:
com.ctc.wstx.stax.WstxEventFactory cannot be cast to
javax.xml.stream.XMLEventFactory
at javax.xml.stream.XMLEventFactory.newInstance(XMLEventFactory.java:30)
at org.apache.poi.openxml4j.opc.internal.marshallers.PackagePropertiesMarshaller.(PackagePropertiesMarshaller.java:41)
at org.apache.poi.openxml4j.opc.OPCPackage.init(OPCPackage.java:161)
at org.apache.poi.openxml4j.opc.OPCPackage.(OPCPackage.java:141)
at org.apache.poi.openxml4j.opc.ZipPackage.(ZipPackage.java:97)
Truncated. see log file for complete stacktrace
commons-codec-1.11
commons-collections4-4.1
commons-logging-1.2
junit-4.12
poi-3.17
poi-excelant-3.17
poi-ooxml-3.17
poi-ooxml-schemas-3.17
poi-scratchpad-3.17
xmlbeans-2.6.0
what could be missed?
Note: I cannot use Maven or similer technologies.
thanks

We found one jar file causes the issue. the name is jsr173_api.jar. once this is deleted, all works fine.

Tomcat not running for a JAR file

I am using Postman alongside a JAR file that runs a REST service that holds some contacts. However when I try to run the JAR file by using: java -jar ContactListRESTService.jar in Powershell, I am seeing a bunch of errors that Apache Tomcat could not run. Postman also doesn't recognize the localhost.
Caused by: java.lang.IllegalStateException: Tomcat connector in failed state
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.start(TomcatEmbeddedServletContainer.java:159)
Caused by: java.lang.IllegalStateException: Tomcat connector in failed state
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.start(TomcatEmbeddedServletCntainer.java:159) ~[spring-boot 1.3.7.RELEASE.jar!/:1.3.7.RELEASE]
I have tried uninstalling and reinstalling JAVA SE per some guidance from a mentor with no results.
If anyone can point me in the right direction please.

NullPointerException when deploying the MBO

I am deploying the MBOs in SUP 2.2 and it is failing with the Null Pointer Exception.
Errors occurred while creating packages.
Deployment Error: Create package failed (package=/TestforSR/.pkg, server=MOF Server)
java.lang.NullPointerException
java.lang.NullPointerException
java.lang.NullPointerException
java.lang.NullPointerException
But it is working fine and able to fetch the response when preview and by using the SOAPUI utilities and not throwing any error or exception. Only the exception when deploying the package.

Check if you are connected the SUP server? And while deploying, it would be better to use the
Update
mode.

I have found a work around for the issue. Not sure if this is the only solution but this is working for me and MBOs are getting deployed to the SUP Server successfully without throwing the Null Pointer Exception.
The webservice that i was using had some parameters of datatype set as enum, which is not supported by SUP and by changing the parameter datatype from enum to String resolved the issue, and error is no more there.