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// Check that stack trace's work, and stack trace line numbers, if available,
// are correct.
public class StackTrace2
{
public static void main(String[] args)
{
try
{
new StackTrace2().a();
}
catch (Exception x)
{
StackTraceElement[] trace = x.getStackTrace();
checkTrace(trace);
}
}
void a()
{
new Inner().foo();
}
class Inner
{
public void foo()
{
doCrash(null);
}
public void doCrash(Object o)
{
o.toString();
}
}
static void checkTrace(StackTraceElement[] trace)
{
System.out.println("Trace length = " + trace.length);
checkLine(trace[0], "StackTrace2$Inner", "doCrash", 33);
checkLine(trace[1], "StackTrace2$Inner", "foo", 28);
checkLine(trace[2], "StackTrace2", "a", 21);
checkLine(trace[3], "StackTrace2", "main", 10);
}
static void checkLine(StackTraceElement frame, String expected_cl,
String expected_method, int expected_line)
{
if (frame.getClassName().equals(expected_cl))
System.out.print(expected_cl);
else
System.out.print("FAIL - expected " + expected_cl + ", got: " +
frame.getClassName());
System.out.print(".");
if (frame.getMethodName().equals(expected_method))
System.out.print(expected_method);
else
System.out.print("FAIL - expected " + expected_method + ", got: " +
frame.getMethodName());
System.out.print(":");
// Permit either the correct line number or no line number. This is so
// we don't fail on platforms that don't yet support reading debug info
// for stack traces, or when no debug info is available.
if (frame.getLineNumber() < 0
|| (frame.getLineNumber() == expected_line
&& frame.getFileName().equals("StackTrace2.java")))
System.out.println("OK");
else
System.out.println("FAIL - expected " + expected_line + ", got: "
+ frame.getLineNumber() + ", in file "
+ frame.getFileName());
}
}
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