test/langtools/tools/javac/processing/T6439826.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 * @test
 * @bug 6439826 6411930 6380018 6392177
 * @summary Exception issuing Diagnostic while processing generated errant code
 * @modules jdk.compiler/com.sun.tools.javac.api
 *          jdk.compiler/com.sun.tools.javac.file
 */

import java.io.*;
import java.util.*;
import javax.annotation.processing.*;
import javax.lang.model.*;
import javax.lang.model.element.*;
import javax.tools.*;
import com.sun.source.util.*;
import com.sun.tools.javac.api.*;
import static javax.lang.model.util.ElementFilter.*;


@SupportedAnnotationTypes("*")
public class T6439826 extends AbstractProcessor {
    public static void main(String... args) throws IOException {
        String testSrc = System.getProperty("test.src", ".");
        String testClasses = System.getProperty("test.classes");
        JavacTool tool = JavacTool.create();
        MyDiagListener dl = new MyDiagListener();
        try (StandardJavaFileManager fm = tool.getStandardFileManager(dl, null, null)) {
            Iterable<? extends JavaFileObject> files =
                fm.getJavaFileObjectsFromFiles(Arrays.asList(new File(testSrc, T6439826.class.getName()+".java")));
            Iterable<String> opts = Arrays.asList("-proc:only",
                                                  "-processor", "T6439826",
                                                  "-processorpath", testClasses);
            StringWriter out = new StringWriter();
            JavacTask task = tool.getTask(out, fm, dl, opts, null, files);
            task.call();
            String s = out.toString();
            System.err.print(s);
            // Expect the following 2 diagnostics, and no output to log
            //   Foo.java:1: illegal character: \35
            //   Foo.java:1: reached end of file while parsing
            System.err.println(dl.count + " diagnostics; " + s.length() + " characters");
            if (dl.count != 2 || s.length() != 0)
                throw new AssertionError("unexpected output from compiler");
        }
    }

    public boolean process(Set<? extends TypeElement> annotations,
                           RoundEnvironment roundEnv) {
        Set<? extends TypeElement> elems = typesIn(roundEnv.getRootElements());
        for (TypeElement e: elems) {
            if (e.getSimpleName().toString().equals(T6439826.class.getName()))
                writeBadFile();
        }
        return false;
    }

    @Override
    public SourceVersion getSupportedSourceVersion() {
        return SourceVersion.latest();
    }

    private void writeBadFile() {
        Filer filer = processingEnv.getFiler();
        Messager messager = processingEnv.getMessager();
        try {
            Writer out = filer.createSourceFile("Foo").openWriter();
            out.write("class Foo #"); // write a file that generates a scanner error
            out.close();
        } catch (IOException e) {
            messager.printMessage(Diagnostic.Kind.ERROR, e.toString());
        }
    }

    static class MyDiagListener implements DiagnosticListener {
        public void report(Diagnostic d) {
            System.err.println(d);
            count++;
        }

        public int count;
    }
}