Writing JavaCompile custom task for a plugin in Java

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I’m writing a JavaCompile task that compiles some files that are generated by another task. `public class CompileGeneratedTask extends JavaCompile {
private static final String COMPILE_GENERATED_INTERNAL = “pojoGenerateCode”;
private PojoGeneratorPluginExtension extension;
private Project project;

@Inject
public CompileGeneratedTask(PojoGeneratorPluginExtension extension) {
    this.extension = extension;
}

private void addCompileGeneratedAction(JavaCompile javaCompile) {
    javaCompile.setSource(new File(extension.getWorkDirectory()));
    javaCompile.setDestinationDir(new File(extension.getGeneratedClassesPath() + extension.getPackageName()));
}
@TaskAction
public void execute() {
    String generatedClassesDirectoryName = extension.getGeneratedClassesPath() + extension.getPackageName();
    File generatedClassesDirectory = new File(generatedClassesDirectoryName);
    if(! generatedClassesDirectory.exists()) {
        generatedClassesDirectory.mkdirs();
    }
    project = getProject();
    JavaCompile pojoCompileGenerated = project.getTasks().create(COMPILE_GENERATED_INTERNAL, JavaCompile.class, this::addCompileGeneratedAction);
    pojoCompileGenerated.getActions().forEach(action -> action.execute(pojoCompileGenerated));
}

}`

Then in the plugin, I register this task as follows:
TaskProvider<CompileGeneratedTask> compileGeneratedCode = tasks.register("compileGenerated", CompileGeneratedTask.class, drwpPojoGen); compileGeneratedCode.configure((task) -> task.dependsOn(generateCode));

However, when I test this task, the test shows a Nullpointer exception on the task actions. My test is as follows:
`public class GenerateCodeTaskTest {
@TempDir
Path projectDir;

private Project project;
private PluginContainer plugins;
private TestSupport testSupport;
private TestSupport.ProjectConfig configureProject;
private PojoGeneratorPluginExtension extension;

@BeforeEach
void setUp() {
    testSupport = TestSupport.create();

    project = testSupport.withProjectDir(projectDir).createProject("PojoGeneratorTestApp", "1.0.0");
    plugins = project.getPlugins();
    plugins.apply(PojoGeneratorPlugin.class);
    extension = project.getExtensions().findByType(PojoGeneratorPluginExtension.class);
    configureProject = testSupport.configureProject();
}

@Test
void test_Code_is_generated() {
    configureProject = configureProject.executeActionsFor("generateCode");
    String[] sourceFiles = {"example1.java", "example2.java"};
    int numberOfSourceFiles = sourceFiles.length;
    String filePath;
    for (int i=0; i<numberOfSourceFiles; i++)
    {
        filePath = extension.getWorkDirectory() + extension.getPackageName() + sourceFiles[i];
        Assertions.assertTrue(new File(filePath).exists());
    }
}

}`