java. Lang. linkageerror: Loader constraint violation in Grails project

I have built a Grails project with POI (including POI - 3.7 and poi - OOXML - 3.7) I've been working on the buildconfig These two external libraries are added to the dependencies in the groovy file There's nothing strange when I compile it However, when I called the command "run app" for the project, the following stacktrace error occurred:

Base Directory: <path-to-my-project>
Resolving dependencies...
Dependencies resolved in 5546ms.
Running script D:\_TOOLS\STS\grails-1.3.5\scripts\RunApp.groovy
Environment set to development
Running Grails application..
2011-05-23 18:51:01,225 [main] ERROR context.GrailsContextLoader  - Error executing bootstraps: java.lang.LinkageError: loader constraint violation: loader (instance of <bootloader>) prevIoUsly initiated loading for a different type with name "org/w3c/dom/DOMConfiguration"
org.codehaus.groovy.runtime.InvokerInvocationException: java.lang.LinkageError: loader constraint violation: loader (instance of <bootloader>) prevIoUsly initiated loading for a different type with name "org/w3c/dom/DOMConfiguration"
    at grails.spring.BeanBuilder.invokeBeanDefiningClosure(BeanBuilder.java:723)
    at grails.spring.BeanBuilder.beans(BeanBuilder.java:573)
    at grails.spring.BeanBuilder.invokeMethod(BeanBuilder.java:519)
    at org.grails.tomcat.TomcatServer.start(TomcatServer.groovy:212)
    at grails.web.container.EmbeddableServer$start.call(UnkNown Source)
    at RunApp$_run_closure5_closure12.doCall(RunApp:158)
    at RunApp$_run_closure5_closure12.doCall(RunApp)
    at _GrailsSettings_groovy$_run_closure10.doCall(_GrailsSettings_groovy:280)
    at _GrailsSettings_groovy$_run_closure10.call(_GrailsSettings_groovy)
    at RunApp$_run_closure5.doCall(RunApp:149)
    at RunApp$_run_closure5.call(RunApp)
    at RunApp.runInline(RunApp:116)
    at RunApp.this$4$runInline(RunApp)
    at RunApp$_run_closure1.doCall(RunApp:59)
    at RunApp$_run_closure1.doCall(RunApp:33)
    at gant.Gant$_dispatch_closure5.doCall(Gant.groovy:381)
    at gant.Gant$_dispatch_closure7.doCall(Gant.groovy:415)
    at gant.Gant$_dispatch_closure7.doCall(Gant.groovy)
    at gant.Gant.withBuildListeners(Gant.groovy:427)
    at gant.Gant.this$2$withBuildListeners(Gant.groovy)
    at gant.Gant$this$2$withBuildListeners.callCurrent(UnkNown Source)
    at gant.Gant.dispatch(Gant.groovy:415)
    at gant.Gant.this$2$dispatch(Gant.groovy)
    at gant.Gant.invokeMethod(Gant.groovy)
    at gant.Gant.executeTargets(Gant.groovy:590)
    at gant.Gant.executeTargets(Gant.groovy:589)

Caused by: java.lang.LinkageError: loader constraint violation: loader (instance of <bootloader>) prevIoUsly initiated loading for a different type with name "org/w3c/dom/DOMConfiguration"
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
    at java.lang.Class.getDeclaredMethods(Class.java:1791)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.codehaus.groovy.util.LazyReference.getLocked(LazyReference.java:46)
    at org.codehaus.groovy.util.LazyReference.get(LazyReference.java:33)
    at grails.spring.DynamicElementReader.invokeMethod(DynamicElementReader.groovy:121)
    ... 26 more

Here is my configuration:

dependencies {  
        provided ('com.oracle:ojdbc6_g:11.2.0.1.0')  
        runtime ('org.apache.poi:poi:3.7','org.apache.poi:poi-ooxml:3.7')  
    }

How can I solve this problem? Thank you.

Solution

This is the repair we finally came back a few hours later In short, exclude xmlbeans from the POI, create another xmlbeans jar, and delete the offending class This is a spell to ward off evil

>Modify buildconfig groovy

dependencies {
       compile ('org.apache.poi:poi-ooxml:3.6') {excludes "xmlbeans"}
    }

>Extract xmlbeans

cd〜 mkdir xmlbeantmp cd xmlbeantmp cp〜/ . ivy2 / cache / org. apache. xmlbeans / xmlbeans / jars / xmlbeans-2.3. 0.jar. jar xf xmlbeans-2.3. 0.jar > delete illegal class package

CD org RM -rf W3C / > recreate jar

cd ../ rm xmlbean-2.3. 0.jar jar cf xmlbean-2.3. 0. Jar * > copy the jar to your project library

cp xmlbean-2.3. 0.jar your_ grails_ project / lib /. > Show love

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