blocks|key|822143|text|将cause参数用于Exceptions+(请看这里+)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|822144|try+{

++//Lots+of+code.+Seriously.+Lots.

}+catch+(Exception+e){
++throw+new+OtherException(e);+//+Trick+is+here
}|code-block|syntax|javascript|822145|这样，您也可以在堆栈跟踪中获得cause异常。|822146|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javase/7/docs/api/java/lang/Exception.html#Exception(java.lang.Throwable%2529)^0|1|5|A|A|M|4|0|0|0|F|5|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Use the <code>cause</code> parameter for <code>Exceptions</code> (<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Exception.html#Exception(java.lang.Throwable)" rel="noreferrer">see here</a>):

<pre><code>try {

 //Lots of code. Seriously. Lots.

} catch (Exception e){
 throw new OtherException(e); // Trick is here
}
</code></pre>

This way you get the <code>cause</code> exception as well in the stacktrace.

blocks|key|822103|text|在Eclipse中，可以设置由异常触发的断点。见添加Java异常断点。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|822104|对于这种特殊情况，您需要确保勾选“挂起捕获的异常”。|822105|一旦Eclipse进入调试器，您将拥有许多可用的工具。您将看到调用堆栈，将能够检查变量等。|822106|entityMap|0|LINK|mutability|MUTABLE|url|http://help.eclipse.org/helios/index.jsp?topic=/org.eclipse.jdt.doc.user/reference/views/breakpoints/ref-addexception_viewaction.htm^0|O|A|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]]]

In Eclipse, you can set a breakpoint triggered by an exception. See <a href="http://help.eclipse.org/helios/index.jsp?topic=/org.eclipse.jdt.doc.user/reference/views/breakpoints/ref-addexception_viewaction.htm" rel="nofollow">Add Java Exception Breakpoint</a>.

For this particular case, you'll need to ensure that "Suspend on caught exceptions" is ticked.

Once Eclipse breaks into the debugger, you'll have a lot of tools at your disposal. You'll see the call stack, will be able to examine variables etc.

blocks|key|822218|text|您可以使用throw+new+OtherException(e);。正如文档解释的那样，此构造函数构造一个具有指定原因的新异常。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|822219|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html#Exception%2528java.lang.Throwable%2529^0|5|S|10|2|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

You can use <code>throw new OtherException(e);</code>. As the <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html#Exception%28java.lang.Throwable%29" rel="nofollow">documentation</a> explains, this constructor constructs a new exception with the specified cause.

blocks|key|643340|text|在抛出异常e时，在OtherException构造函数中传递异常e。它将为您提供完整的堆栈跟踪，其中包含抛出异常的确切行：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|643341|catch+(Exception+e)+{
++++throw+new+OtherException(e);
}|code-block|syntax|javascript|643342|如果OtherException没有接受Exception或Throwable的构造函数，您可以这样做：|643343|catch+(Exception+e)+{
++++OtherException+o+=+new+OtherException();
++++o.initCause(e);
++++throw+o;
}|643344|entityMap^0|9|E|0|0|2|E|K|9|U|9|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|P|$]]

Pass the exception e in your <code>OtherException</code> constructor when throwing it. It will give you the complete stack trace with the exact line throwing the exception:

<pre><code>catch (Exception e) {
 throw new OtherException(e);
}
</code></pre>

If <code>OtherException</code> doesn't have a constructor that takes an <code>Exception</code> or <code>Throwable</code> you could do:

<pre><code>catch (Exception e) {
 OtherException o = new OtherException();
 o.initCause(e);
 throw o;
}
</code></pre>

blocks|key|822285|text|只需打印堆栈跟踪或在调试模式下运行。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|822286|e.printStackTrace()|code-block|syntax|javascript|822287|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Just print stacktrace or run on debug mode

<pre><code>e.printStackTrace()
</code></pre>

blocks|key|1302243|text|您还可以尝试将错误消息打印到控制台：System.out.println(e.getMessage());|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1302244|不过，断点非常有用，因为您可以通过代码跟踪代码，查看它何时到达catch块。|1302245|entityMap^0|I|Z|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

You can also try printing out the error message to the console: <code>System.out.println(e.getMessage());</code>

Breakpoints are very useful though, since you can then trace through the code and see exactly when it gets to the catch block.

Is there a way to find out which line in a try block is throwing an exception?

I'm working on Java in Eclipse which looks like

<pre><code>try {

 //Lots of code. Seriously. Lots.

} catch (Exception e){
 throw new OtherException();
}
</code></pre>

I'm hitting an exception in the try block, (which is then caught). How do I figure out where it's being thrown from?

Problems

<ul>
<li>The stack trace only shows the line in the catch block for the OtherException</li>
<li>Removing the try/catch block isn't straightforward, as there are many exceptions declared as thrown which are required to be caught in order for the code to compile.</li>
</ul>

It feels like there should be a straightforward way of doing this.

Note: I didn't write this code ;-)

Which line in a long Java 'try' block is throwing an exception?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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有没有办法找出try块中的哪一行正在抛出异常？我正在使用Eclipse中的Java，它看起来像try {  //Lots of code. Seriously. Lots.} catch (Exception e){  throw new OtherException();}我在try块中碰到了一个异常(然后被捕获)。我怎么才能弄清楚它是从哪里扔出来的？问题堆栈跟踪仅显示OtherExceptio

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