008-exceptions/src/Main.java

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed 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.
 */

// An error class.
class BadError extends Error {
    public BadError(String s) {
        super("This is bad by convention: " + s);
    }
}

// A class that throws BadError during static initialization.
class BadInit {
    static int dummy;
    static {
        System.out.println("Static Init");
        if (true) {
            throw new BadError("BadInit");
        }
    }
}

// An error that doesn't have a <init>(String) method.
class BadErrorNoStringInit extends Error {
    public BadErrorNoStringInit() {
        super("This is bad by convention");
    }
}

// A class that throws BadErrorNoStringInit during static initialization.
class BadInitNoStringInit {
    static int dummy;
    static {
        System.out.println("Static BadInitNoStringInit");
        if (true) {
            throw new BadErrorNoStringInit();
        }
    }
}

// A class that throws BadError during static initialization, serving as a super class.
class BadSuperClass {
 static int dummy;
 static {
     System.out.println("BadSuperClass Static Init");
     if (true) {
         throw new BadError("BadInit");
     }
 }
}

// A class that derives from BadSuperClass.
class DerivedFromBadSuperClass extends BadSuperClass {
}

/**
 * Exceptions across method calls
 */
public class Main {
    public static void exceptions_007() {
        try {
            catchAndRethrow();
        } catch (NullPointerException npe) {
            System.out.print("Got an NPE: ");
            System.out.println(npe.getMessage());
            npe.printStackTrace(System.out);
        }
    }
    public static void main(String args[]) {
        exceptions_007();
        exceptionsRethrowClassInitFailure();
        exceptionsRethrowClassInitFailureNoStringInit();
        exceptionsForSuperClassInitFailure();
        exceptionsInMultiDex();
    }

    private static void catchAndRethrow() {
        try {
            throwNullPointerException();
        } catch (NullPointerException npe) {
            NullPointerException npe2;
            npe2 = new NullPointerException("second throw");
            npe2.initCause(npe);
            throw npe2;
        }
    }

    private static void throwNullPointerException() {
        throw new NullPointerException("first throw");
    }

    private static void exceptionsRethrowClassInitFailure() {
        try {
            try {
                BadInit.dummy = 1;
                throw new IllegalStateException("Should not reach here.");
            } catch (BadError e) {
                System.out.println(e);
            }

            // Check if it works a second time.

            try {
                BadInit.dummy = 1;
                throw new IllegalStateException("Should not reach here.");
            } catch (NoClassDefFoundError e) {
                System.out.println(e);
                System.out.println(e.getCause());
            }
        } catch (Exception error) {
            error.printStackTrace(System.out);
        }
    }

    private static void exceptionsRethrowClassInitFailureNoStringInit() {
        try {
            try {
                BadInitNoStringInit.dummy = 1;
                throw new IllegalStateException("Should not reach here.");
            } catch (BadErrorNoStringInit e) {
                System.out.println(e);
            }

            // Check if it works a second time.

            try {
                BadInitNoStringInit.dummy = 1;
                throw new IllegalStateException("Should not reach here.");
            } catch (NoClassDefFoundError e) {
                System.out.println(e);
                System.out.println(e.getCause());
            }
        } catch (Exception error) {
            error.printStackTrace(System.out);
        }
    }

    private static void exceptionsForSuperClassInitFailure() {
        try {
            // Resolve DerivedFromBadSuperClass.
            BadSuperClass.dummy = 1;
            throw new IllegalStateException("Should not reach here.");
        } catch (BadError e) {
            System.out.println(e);
        } catch (Throwable t) {
            t.printStackTrace();
        }
        try {
            // Before splitting mirror::Class::kStatusError into
            // kStatusErrorUnresolved and kStatusErrorResolved,
            // this would trigger a
            //     CHECK(super_class->IsResolved())
            // failure in
            //     ClassLinker::LoadSuperAndInterfaces().
            // After the change we're getting either VerifyError
            // (for Optimizing) or NoClassDefFoundError wrapping
            // BadError (for interpreter or JIT).
            new DerivedFromBadSuperClass();
            throw new IllegalStateException("Should not reach here.");
        } catch (NoClassDefFoundError ncdfe) {
            if (!(ncdfe.getCause() instanceof BadError)) {
                ncdfe.getCause().printStackTrace();
            }
        } catch (VerifyError e) {
        } catch (Throwable t) {
            t.printStackTrace();
        }
    }

    private static void exceptionsInMultiDex() {
        try {
            MultiDexBadInit.dummy = 1;
            throw new IllegalStateException("Should not reach here.");
        } catch (Error e) {
            System.out.println(e);
        } catch (Throwable t) {
            t.printStackTrace();
        }
        // Before splitting mirror::Class::kStatusError into
        // kStatusErrorUnresolved and kStatusErrorResolved,
        // the exception from wrapper 1 would have been
        // wrapped in NoClassDefFoundError but the exception
        // from wrapper 2 would have been unwrapped.
        try {
            MultiDexBadInitWrapper1.setDummy(1);
            throw new IllegalStateException("Should not reach here.");
        } catch (NoClassDefFoundError ncdfe) {
            System.out.println(ncdfe);
            System.out.println("  cause: " + ncdfe.getCause());
        } catch (Throwable t) {
            t.printStackTrace();
        }
        try {
            MultiDexBadInitWrapper2.setDummy(1);
            throw new IllegalStateException("Should not reach here.");
        } catch (NoClassDefFoundError ncdfe) {
            System.out.println(ncdfe);
            System.out.println("  cause: " + ncdfe.getCause());
        } catch (Throwable t) {
            t.printStackTrace();
        }
    }
}