test/tools/javac/T8024437/ExceptionInferenceFromClassFileTest.java

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/*
 * @test
 * @bug 8024437
 * @summary Inferring the exception thrown by a lambda: sometimes fails to compile
 * @library /tools/javac/lib
 * @build ToolBox
 * @run main ExceptionInferenceFromClassFileTest
 */

import java.nio.file.Files;
import java.nio.file.Paths;

public class ExceptionInferenceFromClassFileTest {

    static final String ABSrc =
            "class B {\n" +
            "    public static <E extends Throwable> void t(A<E> a) throws E {\n" +
            "        a.run();\n" +
            "    }\n" +
            "}\n" +

            "interface A<E extends Throwable> {\n" +
            "    void run() throws E;\n" +
            "}";

    static final String CSrc =
            "class C {\n" +
            "    public void d() {\n" +
            "        B.t(null);\n" +
            "    }\n" +
            "}";

    public static void main(String[] args) throws Exception {
        Files.createDirectory(Paths.get("out"));

        ToolBox.JavaToolArgs compileABParams =
                new ToolBox.JavaToolArgs()
                .setOptions("-d", "out")
                .setSources(ABSrc);
        ToolBox.javac(compileABParams);

        ToolBox.JavaToolArgs compileCParams =
                new ToolBox.JavaToolArgs()
                .setOptions("-d", "out", "-cp", "out")
                .setSources(CSrc);
        ToolBox.javac(compileCParams);
    }

}