部署
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btrace1.2.5.1已经部署到集群
- /home/xjyin/btrace-1.2.5.1
使用方式
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基本使用方式
sh /btrace-1.2.5.1/bin/btrace <pid> <your .java btrace class>
实战
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动态观察指定进程中所有产生throwable(包括被吞掉的exception)的逻辑(打出stacktrace)
sh ~/xjyin/btrace-1.2.5.1/bin/btrace <pid> ~/xjyin/btrace-1.2.5.1/myClasses/OnThrow.java > exception.log
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OnThrow.java类内容如下
/* * Copyright 2008-2010 Sun Microsystems, Inc. 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. Sun designates this * particular file as subject to the "Classpath" exception as provided * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. */ package lisn; 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; } } }
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更多例子见 ~/xjyin/btrace-1.2.5.1/samples/
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