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OnThrow.java
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/*
* Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the Classpath exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.btrace.samples;
import com.sun.btrace.annotations.*;
import static com.sun.btrace.BTraceUtils.*;
/**
* This example demonstrates printing stack trace
* of an exception and thread local variables. This
* trace script prints exception stack trace whenever
* java.lang.Throwable's constructor returns. This way
* you can trace all exceptions that may be caught and
* "eaten" silently by the traced program. Note that the
* assumption is that the exceptions are thrown soon after
* creation [like in "throw new FooException();"] rather
* that be stored and thrown later.
*/
@BTrace public class OnThrow {
// store current exception in a thread local
// variable (@TLS annotation). Note that we can't
// store it in a global variable!
@TLS static Throwable currentException;
// introduce probe into every constructor of java.lang.Throwable
// class and store "this" in the thread local variable.
@OnMethod(
clazz="java.lang.Throwable",
method="<init>"
)
public static void onthrow(@Self Throwable self) {
currentException = self;
}
@OnMethod(
clazz="java.lang.Throwable",
method="<init>"
)
public static void onthrow1(@Self Throwable self, String s) {
currentException = self;
}
@OnMethod(
clazz="java.lang.Throwable",
method="<init>"
)
public static void onthrow1(@Self Throwable self, String s, Throwable cause) {
currentException = self;
}
@OnMethod(
clazz="java.lang.Throwable",
method="<init>"
)
public static void onthrow2(@Self Throwable self, Throwable cause) {
currentException = self;
}
// when any constructor of java.lang.Throwable returns
// print the currentException's stack trace.
@OnMethod(
clazz="java.lang.Throwable",
method="<init>",
location=@Location(Kind.RETURN)
)
public static void onthrowreturn() {
if (currentException != null) {
Threads.jstack(currentException);
println("=====================");
currentException = null;
}
}
}