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* Download and install svn or git, Java JDK 1.6+, and Apache Ant 1.8+ or Gradle
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* Check out the code from svn or git
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* Import the project into Eclipse or your favorite IDE
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* Write a unit test:
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* Binary formats and Common APIs: src/testcases/org/apache/poi/
* OOXML APIs only: src/ooxml/testcases/org/apache/poi/
* Scratchpad (Binary formats): src/scratchpad/testcases/org/apache/poi/
* test files: test-data/
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* Navigate the source, make changes, and run unit tests to verify
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* Binary formats and Common APIs: src/java/org/apache/poi/
* OOXML APIs only: src/ooxml/java/org/apache/poi/
* Scratchpad (Binary formats): src/scratchpad/src/org/apache/poi/