IBM User Guide for Java V7 on Windows > Troubleshooting and support > Using diagnostic tools > Tracing Java applications and the JVM > Using method trace

Example of method trace output

An example of method trace output.

Sample output using the command java -Xtrace:iprint=mt,methods=java/lang/*.* -version:

10:02:42.281*0x9e900      mt.4         > java/lang/J9VMInternals.initialize(Ljava/lang/Class;)
                              V Compiled static method
10:02:42.281 0x9e900      mt.4          > java/lang/J9VMInternals.verify(Ljava/lang/Class;)
                              V Compiled static method
10:02:42.281 0x9e900      mt.4           > java/lang/J9VMInternals.verify(Ljava/lang/Class;)
                              V Compiled static method
10:02:42.281 0x9e900      mt.4            > java/lang/J9VMInternals.setInitStatus(Ljava/lang/Class;I)
                              V Compiled static method
10:02:42.281 0x9e900      mt.10           < java/lang/J9VMInternals.setInitStatus(Ljava/lang/Class;I)
                              V Compiled static method
10:02:42.281 0x9e900      mt.10          < java/lang/J9VMInternals.verify(Ljava/lang/Class;)
                              V Compiled static method
10:02:42.281 0x9e900      mt.4           > java/lang/J9VMInternals.setInitStatus(Ljava/lang/Class;I)
                              V Compiled static method
10:02:42.281 0x9e900      mt.10          < java/lang/J9VMInternals.setInitStatus(Ljava/lang/Class;I)
                              V Compiled static method
10:02:42.281 0x9e900      mt.10         < java/lang/J9VMInternals.verify(Ljava/lang/Class;)
                              V Compiled static method
10:02:42.281 0x9e900      mt.4          > java/lang/J9VMInternals.initialize(Ljava/lang/Class;)
                              V Compiled static method
10:02:42.281 0x9e900      mt.4           > java/lang/J9VMInternals.setInitStatus(Ljava/lang/Class;I)
                              V Compiled static method
10:02:42.296 0x9e900      mt.10          < java/lang/J9VMInternals.setInitStatus(Ljava/lang/Class;I)
                              V Compiled static method
10:02:42.296 0x9e900      mt.10         < java/lang/J9VMInternals.initialize(Ljava/lang/Class;)
                              V Compiled static method
10:02:42.296 0x9e900      mt.4          > java/lang/String.<clinit>()V Compiled static method
10:02:42.296 0x9e900      mt.4           > java/lang/J9VMInternals.initialize(Ljava/lang/Class;)
                              V Compiled static method
10:02:42.296 0x9e900      mt.4            > java/lang/J9VMInternals.verify(Ljava/lang/Class;)
                              V Compiled static method
10:02:42.296 0x9e900      mt.4             > java/lang/J9VMInternals.verify(Ljava/lang/Class;)
                              V Compiled static method
10:02:42.296 0x9e900      mt.10            < java/lang/J9VMInternals.verify(Ljava/lang/Class;)
                              V Compiled static method
10:02:42.296 0x9e900      mt.4             > java/lang/J9VMInternals.setInitStatus(Ljava/lang/Class;I)
                              V Compiled static method
10:02:42.328 0x9e900      mt.10            < java/lang/J9VMInternals.setInitStatus(Ljava/lang/Class;I)
                              V Compiled static method
10:02:42.328 0x9e900      mt.10           < java/lang/J9VMInternals.verify(Ljava/lang/Class;)
                              V Compiled static method
10:02:42.328 0x9e900      mt.4            > java/lang/J9VMInternals.initialize(Ljava/lang/Class;)
                              V Compiled static method
10:02:42.328 0x9e900      mt.10           < java/lang/J9VMInternals.initialize(Ljava/lang/Class;)
                              V Compiled static method
10:02:42.328 0x9e900      mt.4            > java/lang/J9VMInternals.setInitStatus(Ljava/lang/Class;I)
                              V Compiled static method
10:02:42.328 0x9e900      mt.10           < java/lang/J9VMInternals.setInitStatus(Ljava/lang/Class;I)
                              V Compiled static method
10:02:42.328 0x9e900      mt.10          < java/lang/J9VMInternals.initialize(Ljava/lang/Class;)
                              V Compiled static method

The output lines comprise:

• 0x9e900, the current execenv (execution environment). Because every JVM thread has its own execenv, you can regard execenv as a thread-id. All trace with the same execenv relates to a single thread.
• The individual tracepoint id in the mt component that collects and emits the data.
• The remaining fields show whether a method is being entered (>) or exited (<), followed by details of the method.

Parent: Using method trace

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