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Error: NoClassDefFoundError When Using Eclipse To Run COMSOL Model

I am trying to use Eclipse to run a COMSOL model and I have read the guide from programming reference manual. However, Eclipse always report the error as follows,
Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/DatatypeConverter at com.comsol.client.interfaces.b.(SourceFile:60) at com.comsol.client.interfaces.b.(SourceFile:39) at com.comsol.clientapi.engine.APIEngine$c.b(SourceFile:497) at com.comsol.clientapi.engine.APIEngine.a(SourceFile:115) at com.comsol.clientapi.engine.APIEngine.connect(SourceFile:98) at com.comsol.clientapi.engine.APIEngine.connect(SourceFile:87) at com.comsol.clientapi.engine.ClientModelUtil.connect(SourceFile:145) at com.comsol.clientapi.engine.ClientModelUtil.connect(SourceFile:133) at com.comsol.model.util.ModelUtil.connect(SourceFile:248) at PFCZM_3PBending_QuasiBrittle.main(PFCZM_3PBending_QuasiBrittle.java:16750) Caused by: java.lang.ClassNotFoundException: javax.xml.bind.DatatypeConverter at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:636) at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:182) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519) ... 10 more
I believe I have imported the JAR files correctly and set the path for the project and it seems that the error is due to lack of source file for COMSOL API JAR files. I have checked those JAR file and found they are indeed all class files without definition. How can I solve this problem? Thanks!

getting error java.lang.ClassNotFoundException: AppLoader

I am using custom app loader.
play.application.loader="AppLoader"
I am getting java.lang.ClassNotFoundException: AppLoader error in my play application. The application was working fine earlier.
Stacktrace
! #78am4d92i - Internal server error, for (GET) [/] ->
play.api.PlayException: Cannot load play.application.loader[play.application.loader [AppLoader] was not loaded.]
at play.utils.Reflect$.loadClass$1(Reflect.scala:111)
at play.utils.Reflect$.configuredClass(Reflect.scala:124)
at play.api.ApplicationLoader$.apply(ApplicationLoader.scala:73)
at play.core.server.DevServerStart$$anon$1.$anonfun$reload$3(DevServerStart.scala:173)
at play.utils.Threads$.withContextClassLoader(Threads.scala:21)
at play.core.server.DevServerStart$$anon$1.reload(DevServerStart.scala:171)
at play.core.server.DevServerStart$$anon$1.get(DevServerStart.scala:124)
at play.core.server.AkkaHttpServer.handleRequest(AkkaHttpServer.scala:189)
at play.core.server.AkkaHttpServer.$anonfun$createServerBinding$1(AkkaHttpServer.scala:106)
at akka.stream.impl.fusing.MapAsync$$anon$25.onPush(Ops.scala:1194)
Caused by: java.lang.ClassNotFoundException: AppLoader
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at play.utils.Reflect$.loadClass$1(Reflect.scala:105)
at play.utils.Reflect$.configuredClass(Reflect.scala:124)
at play.api.ApplicationLoader$.apply(ApplicationLoader.scala:73)
at play.core.server.DevServerStart$$anon$1.$anonfun$reload$3(DevServerStart.scala:173)
at play.utils.Threads$.withContextClassLoader(Threads.scala:21)
at play.core.server.DevServerStart$$anon$1.reload(DevServerStart.scala:171)
at play.core.server.DevServerStart$$anon$1.get(DevServerStart.scala:124)
[error] application -

My issue was I was not referencing the class correctly. My previous code referenced the class in application.conf as play.application.loader="AppLoader". Later I moved AppLoader in a package app but I forgot to change the entry in application.conf. I had to change it to play.application.loader="app.AppLoader"

SOLR: Facing issues in starting solr services

I have used java 1.9.0 and the path is correctly set in environment variable. Moreover,both Solr and java are in C drive. But its showing a consistent error:
Error: Could not find or load main class org.apache.solr.util.SolrCLI
Caused by: java.lang.ClassNotFoundException: org.apache.solr.util.SolrCLI
"Failed removing old solr logs"
Error: Could not find or load main class org.apache.solr.util.SolrCLI
Caused by: java.lang.ClassNotFoundException: org.apache.solr.util.SolrCLI
"Failed archiving old GC logs"
Error: Could not find or load main class org.apache.solr.util.SolrCLI
Caused by: java.lang.ClassNotFoundException: org.apache.solr.util.SolrCLI
"Failed archiving old console logs"
Error: Could not find or load main class org.apache.solr.util.SolrCLI
Caused by: java.lang.ClassNotFoundException: org.apache.solr.util.SolrCLI
"Failed rotating old solr logs"
Error: Unable to access jarfile start.jar
Error: Could not find or load main class org.apache.solr.util.SolrCLI
Help me solve this error..

The critical error in the logs seems to be " Unable to access jarfile start.jar".
Maybe this can help SLES Apache Solr start.jar, Unable to access jarfile

ClassCastException on cargo running solr with a dataimport-handler

I'm having issues on getting Solr 4.3.1 to run using the cargo-maven2-plugin. After fixing all classpath issues, I've ended up with the following error:
ERROR org.apache.solr.core.CoreContainer - null:org.apache.solr.common.SolrException: Unable to create core: collection1
at org.apache.solr.core.CoreContainer.recordAndThrow(CoreContainer.java:1450)
at org.apache.solr.core.CoreContainer.create(CoreContainer.java:993)
at org.apache.solr.core.CoreContainer$2.call(CoreContainer.java:597)
<...>
Caused by: org.apache.solr.common.SolrException: RequestHandler init failure
at org.apache.solr.core.SolrCore.<init>(SolrCore.java:821)
at org.apache.solr.core.SolrCore.<init>(SolrCore.java:618)
at org.apache.solr.core.CoreContainer.createFromLocal(CoreContainer.java:949)
at org.apache.solr.core.CoreContainer.create(CoreContainer.java:984)
... 10 more
Caused by: org.apache.solr.common.SolrException: RequestHandler init failure
at org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:168)
at org.apache.solr.core.SolrCore.<init>(SolrCore.java:758)
... 13 more
Caused by: org.apache.solr.common.SolrException: Error Instantiating Request Handler, org.apache.solr.handler.dataimport.DataImportHandler failed to instantiate org.apache.solr.request.SolrRequestHandler
at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:539)
at org.apache.solr.core.SolrCore.createRequestHandler(SolrCore.java:592)
at org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:154)
... 14 more
Caused by: java.lang.ClassCastException: class org.apache.solr.handler.dataimport.DataImportHandler
at java.lang.Class.asSubclass(Class.java:3037)
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:448)
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:396)
at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:518)
... 16 more
I've tried with the tomcat7x and jetty7x containers. If this is a classloader problem, can I somehow force the container to use the same classloader as maven is using?

Going through the stack trace I did a Google search on
Error Instantiating Request Handler, \
org.apache.solr.handler.dataimport.DataImportHandler \
failed to instantiate org.apache.solr.request.SolrRequestHandl
And that brought up the following SO question.
Why can't I instantiate DataImportHandler in Solr on JBoss?
There are many answers that should help resolve the issue.

Jars in my grails project not being picked up when deployed to tomcat 5.5

I am running a grails test run-app all day with my application and it is fine. I type "grails prod war" to get a war, and dump it in the webapps folder of my tomcat install. Now i get the message like so:
11.11.2010 16:35:11 *ERROR* GrailsExceptionResolver: Executing action [index] of controller [ResumeController] caused e
xception: java.lang.NoClassDefFoundError: Could not initialize class org.docx4j.jaxb.Context (GrailsExceptionResolver.ja
va, line 72)
org.codehaus.groovy.grails.web.servlet.mvc.exceptions.ControllerExecutionException: Executing action [index] of controll
er [ResumeController] caused exception: java.lang.NoClassDefFoundError: Could not initialize class org.docx4j.jaxb.Cont
ext
at org.jsecurity.web.servlet.JSecurityFilter.doFilterInternal(JSecurityFilter.java:382)
at org.jsecurity.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:180)
at java.lang.Thread.run(Unknown Source)
Caused by: org.codehaus.groovy.runtime.InvokerInvocationException: java.lang.NoClassDefFoundError: Could not initialize
class org.docx4j.jaxb.Context
... 3 more
Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.docx4j.jaxb.Context
at org.docx4j.openpackaging.contenttype.ContentTypeManager.parseContentTypesFile(ContentTypeManager.java:599)
at org.docx4j.openpackaging.io.LoadFromZipNG.process(LoadFromZipNG.java:199)
at org.docx4j.openpackaging.io.LoadFromZipNG.get(LoadFromZipNG.java:188)
at org.docx4j.openpackaging.packages.OpcPackage.load(OpcPackage.java:188)
at org.docx4j.openpackaging.packages.WordprocessingMLPackage.load(WordprocessingMLPackage.java:169)
at com.iai.skillsdb.DocxHelpers.DocxParser.openDocx4j(DocxParser.java:70)
at ResumeController$_closure8.doCall(ResumeController.groovy:164)
at ResumeController$_closure8.doCall(ResumeController.groovy)
at ResumeController.invokeMethod(ResumeController.groovy)
at ResumeController$_closure1.doCall(ResumeController.groovy:41)
at ResumeController$_closure1.doCall(ResumeController.groovy)
... 3 more
What is causing this? I have the docx4j jar in my WAR for sure, and it is there in the web-inf lib folder as well.

You're getting a java.lang.NoClassDefFoundError, not a java.lang.ClassNotFoundException. The class is being loaded, but a class that it depends on (directly or indirectly via another class) isn't there. You're most likely missing a jar that docx4j requires as a dependency.

Make sure that you have the correct version of docx4j and that there is absolutely no other version of docx4j in your classpath, there may be a version of this lib that did not have the 'Content' class implemented.