tweaked the sample to have a gradle-specific "root directory" finder (almost identical to the existing maven equivalent)

Author: MysterAitch

src/main/java/com/yourorganization/maven_sample/LogicPositivizer.java

@@ -24,7 +24,7 @@ public static void main(String[] args) {
         // SourceRoot is a tool that read and writes Java files from packages on a certain root directory.
         // In this case the root directory is found by taking the root from the current Maven module,
         // with src/main/resources appended.
-        SourceRoot sourceRoot = new SourceRoot(CodeGenerationUtils.mavenModuleRoot(LogicPositivizer.class).resolve("src/main/resources"));
+        SourceRoot sourceRoot = new SourceRoot(Util.gradleModuleRoot(LogicPositivizer.class).resolve("src/main/resources"));
 
         // Our sample is in the root of this directory, so no package name.
         CompilationUnit cu = sourceRoot.parse("", "Blabla.java");

src/main/java/com/yourorganization/maven_sample/Util.java

@@ -0,0 +1,26 @@
+package com.yourorganization.maven_sample;
+
+import com.github.javaparser.utils.CodeGenerationUtils;
+
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+public class Util {
+
+
+    /**
+     * Temporary addition until JavaParser itself contains a similar method.
+     * This is almost identical to the maven equivalent at CodeGenerationUtils#mavenModuleRoot()
+     *
+     * Useful for locating source code within your Gradle project. Finds the classpath for the given class,
+     * then backs up out of multiple directories, until reaching the directory containing build.gradle
+     * "build/(test-)classes/java/main"
+     */
+    public static Path gradleModuleRoot(Class<?> c) {
+        return CodeGenerationUtils
+                .classLoaderRoot(c)
+                .resolve(Paths.get("..", "..", "..", ".."))
+                .normalize();
+    }
+
+}