![]() An alternative approach on Oracle Solaris and Linux operating systems is to send a QUIT signal with the kill -QUIT pid command. When the application is running with HPROF, a heap dump can be created by pressing Control \ or Control Break (depending on the platform) in the application console. See The JAVA_TOOL_OPTIONS Environment Variable for further information about this environment variable. If the JVM is embedded or is not started using a command-line launcher that allows additional options to be provided, then it might be possible to use the JAVA_TOOLS_OPTIONS environment variable so that the -agentlib option is automatically added to the command line. The following sections describe the other ways to diagnose leaks in Java language code. After the dump file is created, it can be used as input to jhat. To use jhat you must obtain one or more heap dumps of the running application, and the dumps must be in binary format. It provides a way to browse an object dump, view all reachable objects in the heap, and understand which references are keeping an object alive. The jhat utility: The jhat utility is useful when debugging unintentional object retention (or memory leaks). The profiler can check where these objects were allocated, which often is sufficient to identify the root cause of the leak. This process includes also the lack of memory reclamations. The NetBeans Profiler, however, uses the pattern of memory allocations and reclamations that such objects typically demonstrate. Commercial memory leak debugging tools may take a long time to locate a leak in a large application. The NetBeans Profiler: The NetBeans Profiler can locate memory leaks very quickly. ![]() The following are two utilities used to diagnose leaks in Java language code. There are many others, and no specific product is recommended. The Eclipse Memory Analyzer Tool (MAT), YourKit (are two examples of commercial tools with memory debugging capabilities. ![]() Besides the tools mentioned in this section, a large number of third-party memory debugger tools are available.
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