XSLT 传输失败，因为 Weblogic 找不到位于 rt.jar 中的类
我们在 Weblogic 10.3 上运行的 Web 应用程序遇到了一个非常奇怪的类未找到问题。在我们的代码中，我们进行了相当标准的 XSLT 转换。
UtilRequestManagerBean.java:
TransformerFactory tFactory = TransformerFactory.newInstance();
Transformer transformer = tFactory.newTransformer(new StreamSource(new StringReader(xslBuffer.toString())));
transformer.transform(new StreamSource(new StringReader(sourceBuffer.toString())), new StreamResult(sw));
这在我们的生产环境（Solaris 10，如果这很重要）中会失败，并产生 java.lang.NoClassDefFoundError：
<Mar 11, 2010 1:44:08 PM EET> <Info> <EJB> <BEA-010227> <EJB Exception occurred during invocation from home or business: com.company.basicservice.ejb.util.UtilRequestManagerBean_temuyq_HomeImpl@1737be7 threw exception: java.lang.NoClassDefFoundError: Could not initialize class com.sun.org.apache.xalan.internal.xsltc.runtime.BasisLibrary>
该类是 rt.jar 的一部分，并且肯定位于类路径中。下面的 Weblogic 日志片段验证了这一点：
sun.boot.class.path = /opt/jdk1.6.0_12/jre/lib/resources.jar:/opt/jdk1.6.0_12/jre/lib/rt.jar:/opt/jdk1.6.0_12/jre/lib/sunrsasign.jar:/opt/jdk1.6.0_12/jre/lib/jsse.jar:/opt/jdk1.6.0_12/jre/lib/jce.jar:/opt/jdk1.6.0_12/jre/lib/charsets.jar:/opt/jdk1.6.0_12/jre/classes
最后列出 rt.jar 的内容表明该类存在：
jar tvf /opt/jdk1.6.0_12/jre/lib/rt.jar | grep BasisLibrary.class
24787 Sat Jan 17 02:25:58 EET 2009 com/sun/org/apache/xalan/internal/xsltc/runtime/BasisLibrary.class
那么，这里到底是什么问题呢？
We have encountered a very strange class not found problem in our web app running on Weblogic 10.3. In our code we do a pretty standard XSLT transformation.
UtilRequestManagerBean.java:
TransformerFactory tFactory = TransformerFactory.newInstance();
Transformer transformer = tFactory.newTransformer(new StreamSource(new StringReader(xslBuffer.toString())));
transformer.transform(new StreamSource(new StringReader(sourceBuffer.toString())), new StreamResult(sw));
This fails in our production environment (Solaris 10, if that matters) and produces a java.lang.NoClassDefFoundError:
<Mar 11, 2010 1:44:08 PM EET> <Info> <EJB> <BEA-010227> <EJB Exception occurred during invocation from home or business: com.company.basicservice.ejb.util.UtilRequestManagerBean_temuyq_HomeImpl@1737be7 threw exception: java.lang.NoClassDefFoundError: Could not initialize class com.sun.org.apache.xalan.internal.xsltc.runtime.BasisLibrary>
This class is part of rt.jar and is definitely in classpath. This is verified by the following Weblogic log snippet:
sun.boot.class.path = /opt/jdk1.6.0_12/jre/lib/resources.jar:/opt/jdk1.6.0_12/jre/lib/rt.jar:/opt/jdk1.6.0_12/jre/lib/sunrsasign.jar:/opt/jdk1.6.0_12/jre/lib/jsse.jar:/opt/jdk1.6.0_12/jre/lib/jce.jar:/opt/jdk1.6.0_12/jre/lib/charsets.jar:/opt/jdk1.6.0_12/jre/classes
And finally listing the contents of rt.jar shows that the class is there:
jar tvf /opt/jdk1.6.0_12/jre/lib/rt.jar | grep BasisLibrary.class
24787 Sat Jan 17 02:25:58 EET 2009 com/sun/org/apache/xalan/internal/xsltc/runtime/BasisLibrary.class
So, what on earth could be the problem here?
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NoClassDefFoundError 并不一定意味着未找到该类 - 它意味着未加载该类的正确版本。
最有可能加载该类的多个版本。您能否检查是否存在冲突源 - 例如某些类也捆绑在 weblogic.jar 中。
检查此包 org/apache/xalan/internal/xsltc/runtime/BasisLibrary 或 BasisLibrary 类本身 - 它是否存在？
或者尝试将 rt.jar 作为类路径中的第一个 jar
NoClassDefFoundError does not necessarily mean the Class was not found - it means the correct version of the class was not loaded.
Most likely multiple versions of the class getting loaded. Can you check if there is a source of conflict - example some classes are bundled in weblogic.jar as well.
Check for this package org/apache/xalan/internal/xsltc/runtime/BasisLibrary or the BasisLibrary class itself - is it present ?
Or try by putting rt.jar as the first jar in the classpath