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src-spring-framework/import-into-eclipse.md

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Spring Framework - Eclipse/STS Project Import Guide

This document will guide you through the process of importing the Spring Framework projects into Eclipse or the Spring Tool Suite (STS). It is recommended that you have a recent version of Eclipse. As a bare minimum you will need Eclipse with full Java 8 support, Eclipse Buildship, and the Groovy plugin.

The following instructions have been tested against STS 4.12.0 (download) (based on Eclipse 4.21) with Eclipse Buildship. The instructions should work with the latest Eclipse distribution as long as you install Buildship. Note that STS 4 comes with Buildship preinstalled.

Steps

When instructed to execute ./gradlew from the command line, be sure to execute it within your locally cloned spring-framework working directory.

  1. Install the Groovy Development Tools.
  2. Switch to Groovy 3.0 in Eclipse (Preferences → Groovy → Compiler → Switch to 3.0...).
    • If you encounter build errors stating something similar to "Groovy: compiler mismatch: project level is 2.5, workspace level is 3.0", change the Groovy compiler version to 3.0 for each affected project.
  3. Ensure that the Forbidden reference (access rule) in Eclipse is set to Info (Preferences → Java → Compiler → Errors/Warnings → Deprecated and restricted API → Forbidden reference (access rule)).
  4. Optionally install the Kotlin Plugin for Eclipse if you need to execute Kotlin-based tests or develop Kotlin extensions.
  5. Optionally install the AspectJ Development Tools (AJDT) if you need to work with the spring-aspects project. The AspectJ Development Tools available in the Eclipse Marketplace have been tested with these instructions using STS 4.5 (Eclipse 4.14).
  6. Optionally install the TestNG plugin in Eclipse if you need to execute individual TestNG test classes or tests in the spring-test module.
    • As an alternative to installing the TestNG plugin, you can execute the org.springframework.test.context.testng.TestNGTestSuite class as a "JUnit 5" test class in Eclipse.
  7. Build spring-oxm from the command line with ./gradlew :spring-oxm:check.
  8. To apply Spring Framework specific settings, run ./gradlew cleanEclipse eclipse from the command line.
  9. Import all projects into Eclipse (File → Import → Gradle → Existing Gradle Project → Navigate to the locally cloned spring-framework directory → Select Finish).
    • If you have not installed AJDT, exclude the spring-aspects project from the import, if prompted, or close it after the import.
    • If you run into errors during the import, you may need to set the Java home for Gradle Buildship to the location of your JDK 8 installation in Eclipse (Preferences → Gradle → Java home).
  10. If you need to execute JAXB-related tests in the spring-oxm project and wish to have the generated sources available, add the build/generated-sources/jaxb folder to the build path (right click on the jaxb folder and select "Build Path → Use as Source Folder").
    • If you do not see the build folder in the spring-oxm project, ensure that the "Gradle build folder" is not filtered out from the view. This setting is available under "Filters" in the configuration of the Package Explorer (available by clicking on the three vertical dots in the upper right corner of the Package Explorer).
  11. Code away!

Known Issues

  1. spring-core should be pre-compiled due to repackaged dependencies.
    • See *RepackJar tasks in the spring-core.gradle build file.
  2. spring-oxm should be pre-compiled due to JAXB types generated for tests.
    • Note that executing ./gradlew :spring-oxm:check as explained in the Steps above will compile spring-core and generate JAXB types for spring-oxm.
  3. spring-aspects does not compile due to references to aspect types unknown to Eclipse.
    • If you installed AJDT into Eclipse it should work.
  4. While JUnit tests pass from the command line with Gradle, some may fail when run from the IDE.
    • Resolving this is a work in progress.
    • If attempting to run all JUnit tests from within the IDE, you may need to set the following VM options to avoid out of memory errors: -XX:MaxPermSize=2048m -Xmx2048m -XX:MaxHeapSize=2048m

Tips

In any case, please do not check in your own generated .classpath file, .project file, or .settings folder. You'll notice these files are already intentionally in .gitignore. The same policy holds for IDEA metadata.