com.sun.enterprise.util.ExceptionUtil Maven / Gradle / Ivy
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package com.sun.enterprise.util;
import java.util.ArrayList;
import java.util.Map;
import java.util.HashMap;
import java.util.Set;
/**
* Useful utilities for Exceptions
* Subset of methods copied from org.glassfish.admin.amx.util
*/
public final class ExceptionUtil
{
private ExceptionUtil()
{
// disallow instantiation
}
/**
Get the chain of exceptions via getCause(). The first element is the
Exception passed.
@param start the Exception to traverse
@return a Throwable[] or an Exception[] as appropriate
*/
public static Throwable[] getCauses(final Throwable start)
{
final ArrayList list = new ArrayList();
boolean haveNonException = false;
Throwable t = start;
while (t != null)
{
list.add(t);
if (!(t instanceof Exception))
{
haveNonException = true;
}
final Throwable temp = t.getCause();
if (temp == null)
{
break;
}
t = temp;
}
final Throwable[] results = haveNonException ? new Throwable[list.size()] : new Exception[list.size()];
list.toArray(results);
return (results);
}
/**
Get the original troublemaker.
@param e the Exception to dig into
@return the original Throwable that started the problem
*/
public static Throwable getRootCause(final Throwable e)
{
final Throwable[] causes = getCauses(e);
return (causes[causes.length - 1]);
}
/**
Get the stack trace as a String.
@param t the Throwabe whose stack trace should be gotten
@return a String containing the stack trace
*/
public static String getStackTrace(Throwable t)
{
final StringBuffer buf = new StringBuffer();
final StackTraceElement[] elems = t.getStackTrace();
for (int i = 0; i < elems.length; ++i)
{
buf.append(elems[i]);
buf.append("\n");
}
return (buf.toString());
}
}