如何在java中捕获嵌套异常 [英] How to catch a nested exception in java

问题描述

我在Apache Tomcat（v6.0.32）中使用Apache Xalan（v.2.7.1）将XML转换为XHTML。有时，客户端会取消加载，并抛出以下异常：

I'm using Apache Xalan (v.2.7.1) to translate XML to XHTML in Apache Tomcat (v6.0.32). Sometimes the loading gets cancelled by the client and the following exception is thrown:

javax.xml.transform.TransformerException: org.apache.xalan.xsltc.TransletException: ClientAbortException:  java.io.IOException
    at org.apache.xalan.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:636)
    at org.apache.xalan.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:303)
...

我想捕获ClientAbortException异常，这样它不会垃圾日志。但是，如何检查异常是否嵌套在ClientAbortException内？我试过这样的东西：

I would like to catch the ClientAbortException-exception, so that it doesn't spam the log. However, how can I check if the exception is nested inside the ClientAbortException? I tried something like this:

...
} catch (Exception e) {
    if (e.getCause() != null && e.getCause().getCause() instanceof org.apache.catalina.connector.ClientAbortException) {
        //do nothing
    } else {
        throw e;
    }
} finally {
...

但是只给我一个nullpointerexception，因为第一个getCause没有一个getCause。任何想法？

But it only gives me a nullpointerexception as the first getCause doesn't have a getCause. Any ideas?

推荐答案

使用 ExceptionUtils.getRootCause（Throwable）在Apache Commons-lang中，它将遍历您的原因链。

Use the ExceptionUtils.getRootCause(Throwable) method in Apache Commons-lang, it will traverse the cause chain for you.

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