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stacktrace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')  
    }

我该如何解决这个问题？非常感谢你！

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lib

cp xmlbean-2.3.0.jar your_grails_project / lib /。
展示爱情

点击接听向上箭头。：）

Answer 2

POI的一个依赖项（xmlbeans）和grails之间存在冲突。您可以按如下方式排除它：

dependencies {
    compile('org.apache.poi:poi-ooxml:3.7') { excludes "xmlbeans" }
}

以下链接有助于追踪问题：

Answer 3

我遇到了类似的问题，这是一个缓存问题。我删除了.grails和.ivy2目录（在家里），它解决了我的麻烦。祝好运。

Answer 4

我想我解决了这个问题。由于Perm gen space /在“grails run-app”中内存不足，史蒂夫·沃尔的解决方案不希望我在grails 2.0.0上工作。

BuildConfig.groovy

....
inherits("global") {
    excludes 'xmlbeans', 'xbean'
}
....
runtime 'xmlbeans:xmlpublic:2.1.0'
runtime 'org.apache.poi:poi-ooxml:3.7'
....

然后下载xbean-2.1.0.jar，并应用Steve Wall的解决方案：

jar xf xbean-2.1.0.jar
cd org
rm -rf w3c/
cd ..
rm xbean-2.1.0.jar
jar cf xbean-2.1.0.patched.jar *
cp xbean-2.1.0.patched.jar your_grails_project/lib/

对我来说它运作正常！祝你好运！

Answer 5

我不知道这是否能解决您的问题，但我的猜测是您对POI的依赖可能应该是编译时。尝试将依赖项更改为：

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

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

5 个答案: