import com.sun.tools.javadoc.api.JavadocTaskImpl; //导入依赖的package包/类
@Test
public void testDirectAccess1() throws Exception {
    JavaFileObject srcFile = createSimpleJavaFileObject();
    Iterable<? extends JavaFileObject> files = Arrays.asList(srcFile);
    Context c = new Context();
    Messager.preRegister(c, "javadoc");
    StandardJavaFileManager fm = new JavacFileManager(c, true, null);
    File outDir = getOutDir();
    fm.setLocation(DocumentationTool.Location.DOCUMENTATION_OUTPUT, Arrays.asList(outDir));
    DocumentationTask t = new JavadocTaskImpl(c, null, null, files);
    if (t.call()) {
        System.err.println("task succeeded");
    } else {
        throw new Exception("task failed");
    }
}
 

import com.sun.tools.javadoc.api.JavadocTaskImpl; //导入依赖的package包/类
@Test
public void testDirectAccess2() throws Exception {
    JavaFileObject srcFile = null; // error, provokes NPE
    Iterable<? extends JavaFileObject> files = Arrays.asList(srcFile);
    Context c = new Context();
    Messager.preRegister(c, "javadoc");
    StandardJavaFileManager fm = new JavacFileManager(c, true, null);
    File outDir = getOutDir();
    fm.setLocation(DocumentationTool.Location.DOCUMENTATION_OUTPUT, Arrays.asList(outDir));
    try {
        DocumentationTask t = new JavadocTaskImpl(c, null, null, files);;
        error("getTask succeeded, no exception thrown");
    } catch (NullPointerException e) {
        System.err.println("exception caught as expected: " + e);
    }
}