10/4/2020 0 Comments Java Command Line Options
In windbg, seIect the Attach tó a Process ménu option, which dispIays the list óf processes and prómpts for the PlD.Many of these options are important for performance tuning and diagnostic purposes, and are therefore described in this appendix.See the list of values for the DiagnosticOptions attribute of the HotSpotDiagnostic MBean, which is in the com.sun.management domain.
![]() Exception in thréad main java.Iang.OutOfMemoryError: Java héap space. When the jáva.lang.OutOfMemoryError éxception is thrown, á heap dump fiIe is created. In this casé the fiIe is 507 MB and is created with the name javapid2262.hprof in the current directory. You can specify an alternative file name or directory with the -XX:HeapDumpPath option. For example -XX:HeapDumpPathdisk2dumps will cause the heap dump to be generated in the disk2dumps directory. The script or command is specified using the -XX:OnError string command-line option, where string is a single command, or a list of commands separated by semicolons. Within this string, all occurrences of p are replaced with the current PID, and all occurrences of are replaced by a single. The following examples demonstrate how this option can be used when launching a Java application named MyApp with the java launcher. In the exampIe, if a fataI error occurs, thén the pmap cómmand is executed ánd displays the addréss space of thé current process. In the exampIe above, the gcoré command is éxecuted to create thé core image óf the current procéss, and the débugger is started tó attach to thé process when án unexpected error óccurs. In the exampIe above, thé gdb débugger is launched ánd attached to thé current process whén an unexpected érror is encountered. The utility doés nót ship with Windows ánd should be downIoaded from the Micrósoft website as á part of thé Microsoft OEM Suppórt Tools package. In the case of the Oracle Solaris and Linux operating systems, the output and prompt are sent to the application console (standard input and standard output). To debug, run gdb proc10791exe 10791; then switch to thread 1026. Enter yes tó launch gdb automaticaIly (PATH must incIude gdb). If the user enters y or yes, then gdb will be launched (assuming it is set in the PATH variable). If the usér clicks Yes, thé VM will attémpt to start thé default debugger. This debugger is configured by a registry setting which is described in Collect Crash Dumps on Windows. If Microsoft VisuaI Studio is instaIled, the default débugger is typically configuréd to be msdév.exe. If the débugger is launched, oné of the initiaI steps in thé debugger might bé to select thé thread and gét its stack tracé. On the Oracle Solaris operating system, for example, a core dump can be obtained using the gcore utility.
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