[英]Getting error number of an exception object
I have a program developed and it has a single entry point. 我开发了一个程序,它只有一个入口点。 A Try catch block is surrounding it. 尝试捕获块围绕它。
try {
Runner runner = new Runner();
// Adhoc code
UIManager.setLookAndFeel(new NimbusLookAndFeel());
runner.setupVariables();
runner.setLookAndFeel();
runner.startSessionFactory();
runner.setupApplicationVariables();
runner.setupDirectories();
// This will be used to test out frames in development mode
if (Runner.isProduction == true) {
execute();
} else {
test();
}
} catch (Exception e) {
SwingHelper.showErrorMessageMainFrame(e.getMessage());
Logger.getRootLogger().error(e);
e.printStackTrace();
}
But suppose a null pointer exception is thrown, the message box is empty since the Exception doesn't contain a message. 但是假设抛出了一个空指针异常,则该消息框为空,因为该异常不包含消息。 For this I added a logic- 为此,我添加了一个逻辑-
if(e instanceof NullPointerException){
NullPointerException n =(NullPointerException) e;
SwingHelper.showErrorMessageMainFrame("Unexpected Exception due at ");
}else{
SwingHelper.showErrorMessageMainFrame(e.getMessage());
}
This works all fine but I also want the line number to be displayed. 一切正常,但我也希望显示行号。 How can I get it done. 我该怎么做。 How can I get the line number of the exception? 如何获得异常的行号?
The metadata for the exception is stored in StackTraceElement class, which you can get from your exception by calling getStackTrace() . 异常的元数据存储在StackTraceElement类中,您可以通过调用getStackTrace()从异常中获取该元数据。
Example of using it is: 使用它的示例是:
if (e instanceof NullPointerException) {
NullPointerException n = (NullPointerException) e;
StackTraceElement stackTrace = n.getStackTrace()[0];
SwingHelper.showErrorMessageMainFrame("Unexpected Exception due at " + stactTrace.getLineNumber());
}
if(e instanceof NullPointerException){
NullPointerException n =(NullPointerException) e;
SwingHelper.showErrorMessageMainFrame("Unexpected Exception due at line" + e.getStackTrace()[0].getLineNumber());
} else {
SwingHelper.showErrorMessageMainFrame(e.getMessage());
}
Wow I was ninja'd by those above... 哇,我被上面的那些人忍住了...
EDIT: Forgot to indent 编辑:忘记缩进
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