Use Palantir Java Format

AGENTS.md

@@ -51,13 +51,13 @@ docs/                     Developer documentation (see below)
 ./gradlew :dd-java-agent:shadowJar        # Build agent jar only (dd-java-agent/build/libs/)
 ./gradlew :path:to:module:test            # Run tests for a specific module
 ./gradlew :path:to:module:test -PtestJvm=11  # Test on a specific JVM version
-./gradlew spotlessApply                   # Auto-format code (google-java-format)
+./gradlew spotlessApply                   # Auto-format code (Palantir Java Format, GOOGLE style)
 ./gradlew spotlessCheck                   # Verify formatting
 ```
 
 ## Code conventions
 
-- **Formatting**: google-java-format enforced via Spotless. Run `./gradlew spotlessApply` before committing.
+- **Formatting**: Palantir Java Format with `GOOGLE` style enforced via Spotless. Run `./gradlew spotlessApply` before committing.
 - **Static imports**: Prefer static imports over class-qualified calls for call-style helpers, in both test (Assertions.assertEquals, Mockito.mock) and production code (Collections.emptyList). Wildcard imports disallowed — see CONTRIBUTING.md.
 - **Documentation**: Use concise Javadoc comments (`/** ... */`) for class, method, and field documentation.
 - **Instrumentation layout**: `dd-java-agent/instrumentation/{framework}/{framework}-{minVersion}/`

CONTRIBUTING.md

@@ -34,6 +34,9 @@ We have automatic code formatting enabled in Gradle configuration using [Spotles
 Our main goal is to avoid extensive reformatting caused by different IDEs with different opinions about how things should
 be formatted by establishing a single _point of truth_.
 
+Java sources use [Palantir Java Format](https://github.com/palantir/palantir-java-format) with its `GOOGLE` style:
+two-space indentation and a 100-character line width.
+
 To reformat all the files that need reformatting:
 
 ```bash
@@ -55,13 +58,15 @@ For IntelliJ IDEA, we suggest the following settings and plugin.
     * `Use single class import`: checked
     * `Class count to use import with '*'`: `9999` (some number sufficiently large that is unlikely to matter)
     * `Names count to use static import with '*'`: `9999`
-    * Use the following import layout to ensure consistency with google-java-format:
+    * Use the following import layout:
       ![import layout](https://user-images.githubusercontent.com/734411/43430811-28442636-94ae-11e8-86f1-f270ddcba023.png)
   * top right Settings icon -> `Settings...` ->`Editor` > `Code Style` > `Groovy` > `Imports`
     * `Class count to use import with '*'`: `9999` (some number sufficiently large that is unlikely to matter)
     * `Names count to use static import with '*'`: `9999`
 * To run test in a specific JDK use the `testJvm` property, e.g. `-PtestJvm=11`
-* Install the [Google Java Format](https://plugins.jetbrains.com/plugin/8527-google-java-format) plugin
+* Format Java sources with the Spotless Gradle tasks above. Do not enable the
+  [Palantir Java Format](https://plugins.jetbrains.com/plugin/13180-palantir-java-format) plugin for this project: it
+  currently exposes only the default `PALANTIR` style, while this project uses `GOOGLE`.
 
 ### Static imports
 

build.gradle.kts

@@ -41,7 +41,7 @@ with(extensions["spotlessPredeclare"] as SpotlessExtension) {
     removeUnusedImports()
     forbidWildcardImports()
 
-    googleJavaFormat(libs.versions.google.java.format.get())
+    palantirJavaFormat(libs.versions.palantir.java.format.get()).style("GOOGLE")
     tableTestFormatter(libs.versions.tabletest.formatter.get())
   }
   groovyGradle {

buildSrc/call-site-instrumentation-plugin/build.gradle.kts

@@ -22,7 +22,7 @@ spotless {
     targetExclude("src/test/resources/**")
     removeUnusedImports()
     forbidWildcardImports()
-    googleJavaFormat(libs.versions.google.java.format.get())
+    palantirJavaFormat(libs.versions.palantir.java.format.get()).style("GOOGLE")
   }
 }
 

buildSrc/modifiable-config-agent/build.gradle.kts

@@ -18,7 +18,7 @@ spotless {
     targetExclude("src/test/resources/**")
     removeUnusedImports()
     forbidWildcardImports()
-    googleJavaFormat(libs.versions.google.java.format.get())
+    palantirJavaFormat(libs.versions.palantir.java.format.get()).style("GOOGLE")
   }
 }
 

gradle/libs.versions.toml

@@ -10,7 +10,7 @@ shadow = "9.4.2"
 spotbugs_annotations = "4.10.3"
 
 # Source code formatters
-google-java-format = "1.36.1"
+palantir-java-format = "2.97.0"
 greclipse = "4.27" # Pinned. See: https://github.com/diffplug/spotless/issues/3013
 ktlint = "1.8.0"
 scalafmt = "3.11.5"

gradle/spotless.gradle

@@ -49,7 +49,7 @@ spotless {
       targetExclude('src/test/resources/**', buildDirectory)
       removeUnusedImports()
       forbidWildcardImports()
-      googleJavaFormat(libs.versions.google.java.format.get())
+      palantirJavaFormat(libs.versions.palantir.java.format.get()).style("GOOGLE")
       tableTestFormatter(libs.versions.tabletest.formatter.get())
     }
   }

test-published-dependencies/build.gradle.kts

@@ -37,7 +37,7 @@ allprojects {
         target("src/**/*.java")
         removeUnusedImports()
         forbidWildcardImports()
-        googleJavaFormat(libs.versions.google.java.format.get())
+        palantirJavaFormat(libs.versions.palantir.java.format.get()).style("GOOGLE")
       }
     }
   }