src/main/java/org/apache/maven/plugin/compiler/TestCompilerMojo.java - maven-compiler-plugin - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
  * regarding copyright ownership.  The ASF licenses this file
  * to you under the Apache License, Version 2.0 (the
  * "License"); you may not use this file except in compliance
  * with the License.  You may obtain a copy of the License at
  *
  *   http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing,
  * software distributed under the License is distributed on an
  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  * KIND, either express or implied.  See the License for the
  * specific language governing permissions and limitations
  * under the License.
  */
 package org.apache.maven.plugin.compiler;

 import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Set;

 import org.apache.maven.plugin.MojoExecutionException;
 import org.apache.maven.plugins.annotations.LifecyclePhase;
 import org.apache.maven.plugins.annotations.Mojo;
 import org.apache.maven.plugins.annotations.Parameter;
 import org.apache.maven.plugins.annotations.ResolutionScope;
 import org.apache.maven.shared.utils.StringUtils;
 import org.apache.maven.toolchain.Toolchain;
 import org.apache.maven.toolchain.java.DefaultJavaToolChain;
 import org.codehaus.plexus.compiler.util.scan.SimpleSourceInclusionScanner;
 import org.codehaus.plexus.compiler.util.scan.SourceInclusionScanner;
 import org.codehaus.plexus.compiler.util.scan.StaleSourceScanner;
 import org.codehaus.plexus.languages.java.jpms.JavaModuleDescriptor;
 import org.codehaus.plexus.languages.java.jpms.LocationManager;
 import org.codehaus.plexus.languages.java.jpms.ResolvePathsRequest;
 import org.codehaus.plexus.languages.java.jpms.ResolvePathsResult;

 /**
  * Compiles application test sources.
  * By default uses the <a href="https://docs.oracle.com/en/java/javase/17/docs/specs/man/javac.html">javac</a> compiler
  * of the JDK used to execute Maven. This can be overwritten through <a href="https://maven.apache.org/guides/mini/guide-using-toolchains.html">Toolchains</a>
  * or parameter {@link AbstractCompilerMojo#compilerId}.
  *
  * @author <a href="mailto:jason@maven.org">Jason van Zyl</a>
  * @since 2.0
  * @see <a href="https://docs.oracle.com/en/java/javase/17/docs/specs/man/javac.html">javac Command</a>
  */
 @Mojo(
         name = "testCompile",
         defaultPhase = LifecyclePhase.TEST_COMPILE,
         threadSafe = true,
         requiresDependencyResolution = ResolutionScope.TEST)
 public class TestCompilerMojo extends AbstractCompilerMojo {
     /**
      * Set this to 'true' to bypass compilation of test sources.
      * Its use is NOT RECOMMENDED, but quite convenient on occasion.
      */
     @Parameter(property = "maven.test.skip")
     private boolean skip;

     /**
      * The source directories containing the test-source to be compiled.
      */
     @Parameter(defaultValue = "${project.testCompileSourceRoots}", readonly = false, required = true)
     private List<String> compileSourceRoots;

     /**
      * The directory where compiled test classes go.
      * <p>
      * This parameter should only be modified in special cases.
      * See the {@link CompilerMojo#outputDirectory} for more information.
      *
      * @see CompilerMojo#outputDirectory
      */
     @Parameter(defaultValue = "${project.build.testOutputDirectory}", required = true, readonly = false)
     private File outputDirectory;

     /**
      * A list of inclusion filters for the compiler.
      */
     @Parameter
     private Set<String> testIncludes = new HashSet<>();

     /**
      * A list of exclusion filters for the compiler.
      */
     @Parameter
     private Set<String> testExcludes = new HashSet<>();

     /**
      * A list of exclusion filters for the incremental calculation.
      * @since 3.11
      */
     @Parameter
     private Set<String> testIncrementalExcludes = new HashSet<>();

     /**
      * The -source argument for the test Java compiler.
      *
      * @since 2.1
      */
     @Parameter(property = "maven.compiler.testSource")
     private String testSource;

     /**
      * The -target argument for the test Java compiler.
      *
      * @since 2.1
      */
     @Parameter(property = "maven.compiler.testTarget")
     private String testTarget;

     /**
      * the -release argument for the test Java compiler
      *
      * @since 3.6
      */
     @Parameter(property = "maven.compiler.testRelease")
     private String testRelease;

     /**
      * <p>
      * Sets the arguments to be passed to test compiler (prepending a dash) if fork is set to true.
      * </p>
      * <p>
      * This is because the list of valid arguments passed to a Java compiler
      * varies based on the compiler version.
      * </p>
      *
      * @since 2.1
      */
     @Parameter
     private Map<String, String> testCompilerArguments;

     /**
      * <p>
      * Sets the unformatted argument string to be passed to test compiler if fork is set to true.
      * </p>
      * <p>
      * This is because the list of valid arguments passed to a Java compiler
      * varies based on the compiler version.
      * </p>
      *
      * @since 2.1
      */
     @Parameter
     private String testCompilerArgument;

     /**
      * <p>
      * Specify where to place generated source files created by annotation processing.
      * Only applies to JDK 1.6+
      * </p>
      *
      * @since 2.2
      */
     @Parameter(defaultValue = "${project.build.directory}/generated-test-sources/test-annotations")
     private File generatedTestSourcesDirectory;

     /**
      * <p>
      * When {@code true}, uses the module path when compiling with a release or target of 9+ and
      * <em>module-info.java</em> or <em>module-info.class</em> is present.
      * When {@code false}, always uses the class path.
      * </p>
      *
      * @since 3.11
      */
     @Parameter(defaultValue = "true")
     private boolean useModulePath;

     @Parameter(defaultValue = "${project.testClasspathElements}", readonly = true)
     private List<String> testPath;

     /**
      * when forking and debug activated the commandline used will be dumped in this file
      * @since 3.10.0
      */
     @Parameter(defaultValue = "javac-test")
     private String debugFileName;

     final LocationManager locationManager = new LocationManager();

     private Map<String, JavaModuleDescriptor> pathElements;

     private Collection<String> classpathElements;

     private Collection<String> modulepathElements;

     public void execute() throws MojoExecutionException, CompilationFailureException {
         if (skip) {
             getLog().info("Not compiling test sources");
             return;
         }
         super.execute();
     }

     protected List<String> getCompileSourceRoots() {
         return compileSourceRoots;
     }

     @Override
     protected Map<String, JavaModuleDescriptor> getPathElements() {
         return pathElements;
     }

     protected List<String> getClasspathElements() {
         return new ArrayList<>(classpathElements);
     }

     @Override
     protected List<String> getModulepathElements() {
         return new ArrayList<>(modulepathElements);
     }

     protected File getOutputDirectory() {
         return outputDirectory;
     }

     @Override
     protected void preparePaths(Set<File> sourceFiles) {
         File mainOutputDirectory = new File(getProject().getBuild().getOutputDirectory());

         File mainModuleDescriptorClassFile = new File(mainOutputDirectory, "module-info.class");
         JavaModuleDescriptor mainModuleDescriptor = null;

         File testModuleDescriptorJavaFile = new File("module-info.java");
         JavaModuleDescriptor testModuleDescriptor = null;

         // Go through the source files to respect includes/excludes
         for (File sourceFile : sourceFiles) {
             // @todo verify if it is the root of a sourcedirectory?
             if ("module-info.java".equals(sourceFile.getName())) {
                 testModuleDescriptorJavaFile = sourceFile;
                 break;
             }
         }

         // Get additional information from the main module descriptor, if available
         if (mainModuleDescriptorClassFile.exists()) {
             ResolvePathsResult<String> result;

             try {
                 ResolvePathsRequest<String> request = ResolvePathsRequest.ofStrings(testPath)
                         .setIncludeStatic(true)
                         .setMainModuleDescriptor(mainModuleDescriptorClassFile.getAbsolutePath());

                 Toolchain toolchain = getToolchain();
                 if (toolchain instanceof DefaultJavaToolChain) {
                     request.setJdkHome(((DefaultJavaToolChain) toolchain).getJavaHome());
                 }

                 result = locationManager.resolvePaths(request);

                 for (Entry<String, Exception> pathException :
                         result.getPathExceptions().entrySet()) {
                     Throwable cause = pathException.getValue();
                     while (cause.getCause() != null) {
                         cause = cause.getCause();
                     }
                     String fileName =
                             Paths.get(pathException.getKey()).getFileName().toString();
                     getLog().warn("Can't extract module name from " + fileName + ": " + cause.getMessage());
                 }
             } catch (IOException e) {
                 throw new RuntimeException(e);
             }

             mainModuleDescriptor = result.getMainModuleDescriptor();

             pathElements = new LinkedHashMap<>(result.getPathElements().size());
             pathElements.putAll(result.getPathElements());

             modulepathElements = result.getModulepathElements().keySet();
             classpathElements = result.getClasspathElements();
         }

         // Get additional information from the test module descriptor, if available
         if (testModuleDescriptorJavaFile.exists()) {
             ResolvePathsResult<String> result;

             try {
                 ResolvePathsRequest<String> request = ResolvePathsRequest.ofStrings(testPath)
                         .setMainModuleDescriptor(testModuleDescriptorJavaFile.getAbsolutePath());

                 Toolchain toolchain = getToolchain();
                 if (toolchain instanceof DefaultJavaToolChain) {
                     request.setJdkHome(((DefaultJavaToolChain) toolchain).getJavaHome());
                 }

                 result = locationManager.resolvePaths(request);
             } catch (IOException e) {
                 throw new RuntimeException(e);
             }

             testModuleDescriptor = result.getMainModuleDescriptor();
         }

         if (!useModulePath) {
             pathElements = Collections.emptyMap();
             modulepathElements = Collections.emptyList();
             classpathElements = testPath;
             return;
         }
         if (StringUtils.isNotEmpty(getRelease())) {
             if (Integer.parseInt(getRelease()) < 9) {
                 pathElements = Collections.emptyMap();
                 modulepathElements = Collections.emptyList();
                 classpathElements = testPath;
                 return;
             }
         } else if (Double.parseDouble(getTarget()) < Double.parseDouble(MODULE_INFO_TARGET)) {
             pathElements = Collections.emptyMap();
             modulepathElements = Collections.emptyList();
             classpathElements = testPath;
             return;
         }

         if (testModuleDescriptor != null) {
             modulepathElements = testPath;
             classpathElements = Collections.emptyList();

             if (mainModuleDescriptor != null) {
                 if (getLog().isDebugEnabled()) {
                     getLog().debug("Main and test module descriptors exist:");
                     getLog().debug("  main module = " + mainModuleDescriptor.name());
                     getLog().debug("  test module = " + testModuleDescriptor.name());
                 }

                 if (testModuleDescriptor.name().equals(mainModuleDescriptor.name())) {
                     if (compilerArgs == null) {
                         compilerArgs = new ArrayList<>();
                     }
                     compilerArgs.add("--patch-module");

                     StringBuilder patchModuleValue = new StringBuilder();
                     patchModuleValue.append(testModuleDescriptor.name());
                     patchModuleValue.append('=');

                     for (String root : getProject().getCompileSourceRoots()) {
                         if (Files.exists(Paths.get(root))) {
                             patchModuleValue.append(root).append(PS);
                         }
                     }

                     compilerArgs.add(patchModuleValue.toString());
                 } else {
                     getLog().debug("Black-box testing - all is ready to compile");
                 }
             } else {
                 // No main binaries available? Means we're a test-only project.
                 if (!mainOutputDirectory.exists()) {
                     return;
                 }
                 // very odd
                 // Means that main sources must be compiled with -modulesource and -Xmodule:<moduleName>
                 // However, this has a huge impact since you can't simply use it as a classpathEntry
                 // due to extra folder in between
                 throw new UnsupportedOperationException(
                         "Can't compile test sources " + "when main sources are missing a module descriptor");
             }
         } else {
             if (mainModuleDescriptor != null) {
                 if (compilerArgs == null) {
                     compilerArgs = new ArrayList<>();
                 }
                 compilerArgs.add("--patch-module");

                 StringBuilder patchModuleValue = new StringBuilder(mainModuleDescriptor.name())
                         .append('=')
                         .append(mainOutputDirectory)
                         .append(PS);
                 for (String root : compileSourceRoots) {
                     patchModuleValue.append(root).append(PS);
                 }

                 compilerArgs.add(patchModuleValue.toString());

                 compilerArgs.add("--add-reads");
                 compilerArgs.add(mainModuleDescriptor.name() + "=ALL-UNNAMED");
             } else {
                 modulepathElements = Collections.emptyList();
                 classpathElements = testPath;
             }
         }
     }

     protected SourceInclusionScanner getSourceInclusionScanner(int staleMillis) {
         SourceInclusionScanner scanner;

         if (testIncludes.isEmpty() && testExcludes.isEmpty() && testIncrementalExcludes.isEmpty()) {
             scanner = new StaleSourceScanner(staleMillis);
         } else {
             if (testIncludes.isEmpty()) {
                 testIncludes.add("**/*.java");
             }
             Set<String> excludesIncr = new HashSet<>(testExcludes);
             excludesIncr.addAll(this.testIncrementalExcludes);
             scanner = new StaleSourceScanner(staleMillis, testIncludes, excludesIncr);
         }

         return scanner;
     }

     protected SourceInclusionScanner getSourceInclusionScanner(String inputFileEnding) {
         SourceInclusionScanner scanner;

         // it's not defined if we get the ending with or without the dot '.'
         String defaultIncludePattern = "**/*" + (inputFileEnding.startsWith(".") ? "" : ".") + inputFileEnding;

         if (testIncludes.isEmpty() && testExcludes.isEmpty() && testIncrementalExcludes.isEmpty()) {
             testIncludes = Collections.singleton(defaultIncludePattern);
             scanner = new SimpleSourceInclusionScanner(testIncludes, Collections.emptySet());
         } else {
             if (testIncludes.isEmpty()) {
                 testIncludes.add(defaultIncludePattern);
             }
             Set<String> excludesIncr = new HashSet<>(testExcludes);
             excludesIncr.addAll(this.testIncrementalExcludes);
             scanner = new SimpleSourceInclusionScanner(testIncludes, excludesIncr);
         }

         return scanner;
     }

     protected String getSource() {
         return testSource == null ? source : testSource;
     }

     protected String getTarget() {
         return testTarget == null ? target : testTarget;
     }

     @Override
     protected String getRelease() {
         return testRelease == null ? release : testRelease;
     }

     protected String getCompilerArgument() {
         return testCompilerArgument == null ? compilerArgument : testCompilerArgument;
     }

     protected Map<String, String> getCompilerArguments() {
         return testCompilerArguments == null ? compilerArguments : testCompilerArguments;
     }

     protected File getGeneratedSourcesDirectory() {
         return generatedTestSourcesDirectory;
     }

     @Override
     protected String getDebugFileName() {
         return debugFileName;
     }

     @Override
     protected boolean isTestCompile() {
         return true;
     }

     @Override
     protected Set<String> getIncludes() {
         return testIncludes;
     }

     @Override
     protected Set<String> getExcludes() {
         return testExcludes;
     }
 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one
	* or more contributor license agreements. See the NOTICE file
	* distributed with this work for additional information
	* regarding copyright ownership. The ASF licenses this file
	* to you under the Apache License, Version 2.0 (the
	* "License"); you may not use this file except in compliance
	* with the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing,
	* software distributed under the License is distributed on an
	* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
	* KIND, either express or implied. See the License for the
	* specific language governing permissions and limitations
	* under the License.
	*/
	package org.apache.maven.plugin.compiler;

	import java.io.File;
	import java.io.IOException;
	import java.nio.file.Files;
	import java.nio.file.Paths;
	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.Collections;
	import java.util.HashSet;
	import java.util.LinkedHashMap;
	import java.util.List;
	import java.util.Map;
	import java.util.Map.Entry;
	import java.util.Set;

	import org.apache.maven.plugin.MojoExecutionException;
	import org.apache.maven.plugins.annotations.LifecyclePhase;
	import org.apache.maven.plugins.annotations.Mojo;
	import org.apache.maven.plugins.annotations.Parameter;
	import org.apache.maven.plugins.annotations.ResolutionScope;
	import org.apache.maven.shared.utils.StringUtils;
	import org.apache.maven.toolchain.Toolchain;
	import org.apache.maven.toolchain.java.DefaultJavaToolChain;
	import org.codehaus.plexus.compiler.util.scan.SimpleSourceInclusionScanner;
	import org.codehaus.plexus.compiler.util.scan.SourceInclusionScanner;
	import org.codehaus.plexus.compiler.util.scan.StaleSourceScanner;
	import org.codehaus.plexus.languages.java.jpms.JavaModuleDescriptor;
	import org.codehaus.plexus.languages.java.jpms.LocationManager;
	import org.codehaus.plexus.languages.java.jpms.ResolvePathsRequest;
	import org.codehaus.plexus.languages.java.jpms.ResolvePathsResult;

	/**
	* Compiles application test sources.
	* By default uses the <a href="https://docs.oracle.com/en/java/javase/17/docs/specs/man/javac.html">javac</a> compiler
	* of the JDK used to execute Maven. This can be overwritten through <a href="https://maven.apache.org/guides/mini/guide-using-toolchains.html">Toolchains</a>
	* or parameter {@link AbstractCompilerMojo#compilerId}.
	*
	* @author <a href="mailto:jason@maven.org">Jason van Zyl</a>
	* @since 2.0
	* @see <a href="https://docs.oracle.com/en/java/javase/17/docs/specs/man/javac.html">javac Command</a>
	*/
	@Mojo(
	name = "testCompile",
	defaultPhase = LifecyclePhase.TEST_COMPILE,
	threadSafe = true,
	requiresDependencyResolution = ResolutionScope.TEST)
	public class TestCompilerMojo extends AbstractCompilerMojo {
	/**
	* Set this to 'true' to bypass compilation of test sources.
	* Its use is NOT RECOMMENDED, but quite convenient on occasion.
	*/
	@Parameter(property = "maven.test.skip")
	private boolean skip;

	/**
	* The source directories containing the test-source to be compiled.
	*/
	@Parameter(defaultValue = "${project.testCompileSourceRoots}", readonly = false, required = true)
	private List<String> compileSourceRoots;

	/**
	* The directory where compiled test classes go.
	* <p>
	* This parameter should only be modified in special cases.
	* See the {@link CompilerMojo#outputDirectory} for more information.
	*
	* @see CompilerMojo#outputDirectory
	*/
	@Parameter(defaultValue = "${project.build.testOutputDirectory}", required = true, readonly = false)
	private File outputDirectory;

	/**
	* A list of inclusion filters for the compiler.
	*/
	@Parameter
	private Set<String> testIncludes = new HashSet<>();

	/**
	* A list of exclusion filters for the compiler.
	*/
	@Parameter
	private Set<String> testExcludes = new HashSet<>();

	/**
	* A list of exclusion filters for the incremental calculation.
	* @since 3.11
	*/
	@Parameter
	private Set<String> testIncrementalExcludes = new HashSet<>();

	/**
	* The -source argument for the test Java compiler.
	*
	* @since 2.1
	*/
	@Parameter(property = "maven.compiler.testSource")
	private String testSource;

	/**
	* The -target argument for the test Java compiler.
	*
	* @since 2.1
	*/
	@Parameter(property = "maven.compiler.testTarget")
	private String testTarget;

	/**
	* the -release argument for the test Java compiler
	*
	* @since 3.6
	*/
	@Parameter(property = "maven.compiler.testRelease")
	private String testRelease;

	/**
	* <p>
	* Sets the arguments to be passed to test compiler (prepending a dash) if fork is set to true.
	* </p>
	* <p>
	* This is because the list of valid arguments passed to a Java compiler
	* varies based on the compiler version.
	* </p>
	*
	* @since 2.1
	*/
	@Parameter
	private Map<String, String> testCompilerArguments;

	/**
	* <p>
	* Sets the unformatted argument string to be passed to test compiler if fork is set to true.
	* </p>
	* <p>
	* This is because the list of valid arguments passed to a Java compiler
	* varies based on the compiler version.
	* </p>
	*
	* @since 2.1
	*/
	@Parameter
	private String testCompilerArgument;

	/**
	* <p>
	* Specify where to place generated source files created by annotation processing.
	* Only applies to JDK 1.6+
	* </p>
	*
	* @since 2.2
	*/
	@Parameter(defaultValue = "${project.build.directory}/generated-test-sources/test-annotations")
	private File generatedTestSourcesDirectory;

	/**
	* <p>
	* When {@code true}, uses the module path when compiling with a release or target of 9+ and
	* <em>module-info.java</em> or <em>module-info.class</em> is present.
	* When {@code false}, always uses the class path.
	* </p>
	*
	* @since 3.11
	*/
	@Parameter(defaultValue = "true")
	private boolean useModulePath;

	@Parameter(defaultValue = "${project.testClasspathElements}", readonly = true)
	private List<String> testPath;

	/**
	* when forking and debug activated the commandline used will be dumped in this file
	* @since 3.10.0
	*/
	@Parameter(defaultValue = "javac-test")
	private String debugFileName;

	final LocationManager locationManager = new LocationManager();

	private Map<String, JavaModuleDescriptor> pathElements;

	private Collection<String> classpathElements;

	private Collection<String> modulepathElements;

	public void execute() throws MojoExecutionException, CompilationFailureException {
	if (skip) {
	getLog().info("Not compiling test sources");
	return;
	}
	super.execute();
	}

	protected List<String> getCompileSourceRoots() {
	return compileSourceRoots;
	}

	@Override
	protected Map<String, JavaModuleDescriptor> getPathElements() {
	return pathElements;
	}

	protected List<String> getClasspathElements() {
	return new ArrayList<>(classpathElements);
	}

	@Override
	protected List<String> getModulepathElements() {
	return new ArrayList<>(modulepathElements);
	}

	protected File getOutputDirectory() {
	return outputDirectory;
	}

	@Override
	protected void preparePaths(Set<File> sourceFiles) {
	File mainOutputDirectory = new File(getProject().getBuild().getOutputDirectory());

	File mainModuleDescriptorClassFile = new File(mainOutputDirectory, "module-info.class");
	JavaModuleDescriptor mainModuleDescriptor = null;

	File testModuleDescriptorJavaFile = new File("module-info.java");
	JavaModuleDescriptor testModuleDescriptor = null;

	// Go through the source files to respect includes/excludes
	for (File sourceFile : sourceFiles) {
	// @todo verify if it is the root of a sourcedirectory?
	if ("module-info.java".equals(sourceFile.getName())) {
	testModuleDescriptorJavaFile = sourceFile;
	break;
	}
	}

	// Get additional information from the main module descriptor, if available
	if (mainModuleDescriptorClassFile.exists()) {
	ResolvePathsResult<String> result;

	try {
	ResolvePathsRequest<String> request = ResolvePathsRequest.ofStrings(testPath)
	.setIncludeStatic(true)
	.setMainModuleDescriptor(mainModuleDescriptorClassFile.getAbsolutePath());

	Toolchain toolchain = getToolchain();
	if (toolchain instanceof DefaultJavaToolChain) {
	request.setJdkHome(((DefaultJavaToolChain) toolchain).getJavaHome());
	}

	result = locationManager.resolvePaths(request);

	for (Entry<String, Exception> pathException :
	result.getPathExceptions().entrySet()) {
	Throwable cause = pathException.getValue();
	while (cause.getCause() != null) {
	cause = cause.getCause();
	}
	String fileName =
	Paths.get(pathException.getKey()).getFileName().toString();
	getLog().warn("Can't extract module name from " + fileName + ": " + cause.getMessage());
	}
	} catch (IOException e) {
	throw new RuntimeException(e);
	}

	mainModuleDescriptor = result.getMainModuleDescriptor();

	pathElements = new LinkedHashMap<>(result.getPathElements().size());
	pathElements.putAll(result.getPathElements());

	modulepathElements = result.getModulepathElements().keySet();
	classpathElements = result.getClasspathElements();
	}

	// Get additional information from the test module descriptor, if available
	if (testModuleDescriptorJavaFile.exists()) {
	ResolvePathsResult<String> result;

	try {
	ResolvePathsRequest<String> request = ResolvePathsRequest.ofStrings(testPath)
	.setMainModuleDescriptor(testModuleDescriptorJavaFile.getAbsolutePath());

	Toolchain toolchain = getToolchain();
	if (toolchain instanceof DefaultJavaToolChain) {
	request.setJdkHome(((DefaultJavaToolChain) toolchain).getJavaHome());
	}

	result = locationManager.resolvePaths(request);
	} catch (IOException e) {
	throw new RuntimeException(e);
	}

	testModuleDescriptor = result.getMainModuleDescriptor();
	}

	if (!useModulePath) {
	pathElements = Collections.emptyMap();
	modulepathElements = Collections.emptyList();
	classpathElements = testPath;
	return;
	}
	if (StringUtils.isNotEmpty(getRelease())) {
	if (Integer.parseInt(getRelease()) < 9) {
	pathElements = Collections.emptyMap();
	modulepathElements = Collections.emptyList();
	classpathElements = testPath;
	return;
	}
	} else if (Double.parseDouble(getTarget()) < Double.parseDouble(MODULE_INFO_TARGET)) {
	pathElements = Collections.emptyMap();
	modulepathElements = Collections.emptyList();
	classpathElements = testPath;
	return;
	}

	if (testModuleDescriptor != null) {
	modulepathElements = testPath;
	classpathElements = Collections.emptyList();

	if (mainModuleDescriptor != null) {
	if (getLog().isDebugEnabled()) {
	getLog().debug("Main and test module descriptors exist:");
	getLog().debug(" main module = " + mainModuleDescriptor.name());
	getLog().debug(" test module = " + testModuleDescriptor.name());
	}

	if (testModuleDescriptor.name().equals(mainModuleDescriptor.name())) {
	if (compilerArgs == null) {
	compilerArgs = new ArrayList<>();
	}
	compilerArgs.add("--patch-module");

	StringBuilder patchModuleValue = new StringBuilder();
	patchModuleValue.append(testModuleDescriptor.name());
	patchModuleValue.append('=');

	for (String root : getProject().getCompileSourceRoots()) {
	if (Files.exists(Paths.get(root))) {
	patchModuleValue.append(root).append(PS);
	}
	}

	compilerArgs.add(patchModuleValue.toString());
	} else {
	getLog().debug("Black-box testing - all is ready to compile");
	}
	} else {
	// No main binaries available? Means we're a test-only project.
	if (!mainOutputDirectory.exists()) {
	return;
	}
	// very odd
	// Means that main sources must be compiled with -modulesource and -Xmodule:<moduleName>
	// However, this has a huge impact since you can't simply use it as a classpathEntry
	// due to extra folder in between
	throw new UnsupportedOperationException(
	"Can't compile test sources " + "when main sources are missing a module descriptor");
	}
	} else {
	if (mainModuleDescriptor != null) {
	if (compilerArgs == null) {
	compilerArgs = new ArrayList<>();
	}
	compilerArgs.add("--patch-module");

	StringBuilder patchModuleValue = new StringBuilder(mainModuleDescriptor.name())
	.append('=')
	.append(mainOutputDirectory)
	.append(PS);
	for (String root : compileSourceRoots) {
	patchModuleValue.append(root).append(PS);
	}

	compilerArgs.add(patchModuleValue.toString());

	compilerArgs.add("--add-reads");
	compilerArgs.add(mainModuleDescriptor.name() + "=ALL-UNNAMED");
	} else {
	modulepathElements = Collections.emptyList();
	classpathElements = testPath;
	}
	}
	}

	protected SourceInclusionScanner getSourceInclusionScanner(int staleMillis) {
	SourceInclusionScanner scanner;

	if (testIncludes.isEmpty() && testExcludes.isEmpty() && testIncrementalExcludes.isEmpty()) {
	scanner = new StaleSourceScanner(staleMillis);
	} else {
	if (testIncludes.isEmpty()) {
	testIncludes.add("*/.java");
	}
	Set<String> excludesIncr = new HashSet<>(testExcludes);
	excludesIncr.addAll(this.testIncrementalExcludes);
	scanner = new StaleSourceScanner(staleMillis, testIncludes, excludesIncr);
	}

	return scanner;
	}

	protected SourceInclusionScanner getSourceInclusionScanner(String inputFileEnding) {
	SourceInclusionScanner scanner;

	// it's not defined if we get the ending with or without the dot '.'
	String defaultIncludePattern = "*/" + (inputFileEnding.startsWith(".") ? "" : ".") + inputFileEnding;

	if (testIncludes.isEmpty() && testExcludes.isEmpty() && testIncrementalExcludes.isEmpty()) {
	testIncludes = Collections.singleton(defaultIncludePattern);
	scanner = new SimpleSourceInclusionScanner(testIncludes, Collections.emptySet());
	} else {
	if (testIncludes.isEmpty()) {
	testIncludes.add(defaultIncludePattern);
	}
	Set<String> excludesIncr = new HashSet<>(testExcludes);
	excludesIncr.addAll(this.testIncrementalExcludes);
	scanner = new SimpleSourceInclusionScanner(testIncludes, excludesIncr);
	}

	return scanner;
	}

	protected String getSource() {
	return testSource == null ? source : testSource;
	}

	protected String getTarget() {
	return testTarget == null ? target : testTarget;
	}

	@Override
	protected String getRelease() {
	return testRelease == null ? release : testRelease;
	}

	protected String getCompilerArgument() {
	return testCompilerArgument == null ? compilerArgument : testCompilerArgument;
	}

	protected Map<String, String> getCompilerArguments() {
	return testCompilerArguments == null ? compilerArguments : testCompilerArguments;
	}

	protected File getGeneratedSourcesDirectory() {
	return generatedTestSourcesDirectory;
	}

	@Override
	protected String getDebugFileName() {
	return debugFileName;
	}

	@Override
	protected boolean isTestCompile() {
	return true;
	}

	@Override
	protected Set<String> getIncludes() {
	return testIncludes;
	}

	@Override
	protected Set<String> getExcludes() {
	return testExcludes;
	}
	}