JPatchInst is instrumentation tool for Java APR tools. It compares the buggy program and patched program and instruments patched program with considering the differences between them.

In default, JPatchInst adds branch counter for each branches. If you want your own instrumentation, you can easily add your own instrumentation.

JDK 1.8.

Java version of the target project should be lower or equal to 1.8 (version 1.8 is recommended).

JPatchInst works well with all Defects4j subjects except Mockito.

Clone JPatchInst:

git clone https://github.com/UNIST-LOFT/JPatchInst.git

Build JPatchInst:

cd JPatchInst
./gradlew shadowJar

Compiled .jar file will be generated in build/libs/.

Run JPatchInst with:

java -jar build/libs/JPatchInst.jar [options] <original_class_path> <patched_class_path>

• original_class_path: the path of the original class file
• patched_class_path: the path of the patched class file

• -i/--branch-id <ids>: Specify the branch ID to instrument. IDs seperated with comma(,). Default is None (i.e. all branches).
• -t/--time-output-file <file>: Compute and save the time to instrument each file.

For example, if the project is Maven project, run JPatchInst with:

java -jar <path-to-JPatchInst>/build/libs/JPatchInst.jar <path-to-buggy>/target/classes <path-to-patched>/target/classes