java.lang.LinkageError:Grails项目中的加载器约束违规

Question

我用POI构建了一个Grails项目(包括poi-3.7和poi-ooxml-3.7).我已经在项目的BuildConfig.groovy文件中将这两个外部库添加到依赖项块中.编译时没什么奇怪的.但是当我为该项目调用命令"run-app"时,下面的堆栈跟踪发生错误:

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  

这是我的配置:

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')  
    }  

我怎么做才能解决这个问题？非常感谢!

Answer 1

这是经过几个小时的来回走动后我们终于来到的解决方案.简而言之,从poi中排除xmlbeans并创建另一个删除了违规类的xmlbeans jar.这是驱除邪恶联系错误的咒语.

• 修改BuildConfig.groovy

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

• 提取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
  

• 删除违规类包

  cd org
  rm -rf w3c /
  

• 重新创建jar

  cd ../
  rm xmlbean-2.3.0.jar
  jar cf xmlbean-2.3.0.jar*
  

• 将jar复制到项目库中

  cp xmlbean-2.3.0.jar your_grails_project/lib /.
  

• 表达爱意

  点击接听向上箭头.:)