Occasional Thoughts :: Software :: Jaclin

Jaclin

Jaclin (Java Class Infomation) can analyze compiled class files and show the Java version that has been used to compile. It will also show you, whether a class has been compiled in debug mode and which debug levels have been applied.

Usage

Extract the downloaded ZIP or tar/gz file to a directory. A Java Runtime Environment version 5 or higher is required to run Jaclin.

Unix/Linux: Using shell script on Unices:

 ./jaclin.sh <class file> [<class file>...]

Jaclin will select the used JVM based on the JAVA_HOME environment variable. If
JAVA_HOME is not set, the java executable is used from the PATH environment
variable.

Feel free to create a symbolic link to jaclin.sh in a directory that is in the
path, e.g.

ln -s $HOME/opt/jaclin/jaclin.sh $HOME/bin/jaclin

Microsoft Windows: Use the batch file:

./jaclin.bat <class file> [<class file>...]

Jaclin uses the JVM identified by the JAVA_HOME environment variable.

The script has not been tested yet. If you are a Windows user help is greatly
appreciated.

Other operating systems:

 java -jar jaclin.jar <class file> [<class file>...]

Example

Running jaclin on some compiled test files:

> ./jaclin.sh test/data/*
test/data/ByteStreamAnalyzer_invalid.class
    ERROR: Not a valid classfile
test/data/ByteStreamAnalyzer_lines.class
    Class version: 49.0 (Java 5)
    Debug information available: Yes
    Debug level(s): lines
test/data/ByteStreamAnalyzer_lines_vars.class
    Class version: 49.0 (Java 5)
    Debug information available: Yes
    Debug level(s): lines vars
test/data/ByteStreamAnalyzer_release.class
    Class version: 49.0 (Java 5)
    Debug information available: No
test/data/ByteStreamAnalyzer_unknownversion.class
    Unknown version.
    Debug information available: Yes
    Debug level(s): lines
test/data/ByteStreamAnalyzer_vars.class
    Class version: 49.0 (Java 5)
    Debug information available: Yes
    Debug level(s): vars
test/data/ClassAnalyzer_release.class
    Class version: 49.0 (Java 5)
    Debug information available: No

Download

Binary distribution containing the necessary files only:

BInary distribution containing source code along with the full Eclipse project.

ToDo

I hate ToDo lists, but anyway...

  • Ability to analyze JAR files without the need to extract it.
  • Recursive reporting of class and jar files in directories.
  • Mow the lawn.

License

Released under the terms of the Apache License, version 2.0.

Questions or Feedback?

Please see the 0.1 release announcement and add a comment or vote and comment on Java-Apps.org.

Carsten Schlipf
2008-09-17