Or-tools: java.lang.NoClassDefFoundError (AbstractMessageLite$InternalOneOfEnum)

[lalithsuresh]

I'm on or-tools 7.4 on the java version, using the cp-sat solver. Invoking CpModel.model() (or any other way to access the underlying proto) throws the below exception.

Adding the protobuf-java 3.9.0 or 3.10.0 dependencies to my build doesn't seem to fix the problem. Any idea what dependency I'm missing here?

java.lang.NoClassDefFoundError: com/google/protobuf/AbstractMessageLite$InternalOneOfEnum

    at java.base/java.lang.ClassLoader.defineClass1(Native Method)
    at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016)
    at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:151)
    at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:802)
    at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:700)
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:623)
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
    at java.base/java.lang.Class.getDeclaredMethods0(Native Method)
    at java.base/java.lang.Class.privateGetDeclaredMethods(Class.java:3172)
    at java.base/java.lang.Class.getMethodsRecursive(Class.java:3313)
    at java.base/java.lang.Class.getMethod0(Class.java:3299)
    at java.base/java.lang.Class.getMethod(Class.java:2112)
    at com.google.protobuf.GeneratedMessageV3.getMethodOrDie(GeneratedMessageV3.java:1752)
    at com.google.protobuf.GeneratedMessageV3.access$1000(GeneratedMessageV3.java:79)
    at com.google.protobuf.GeneratedMessageV3$FieldAccessorTable$RepeatedMessageFieldAccessor.<init>(GeneratedMessageV3.java:2742)
    at com.google.protobuf.GeneratedMessageV3$FieldAccessorTable.ensureFieldAccessorsInitialized(GeneratedMessageV3.java:1867)
    at com.google.ortools.sat.CpModelProto.internalGetFieldAccessorTable(CpModelProto.java:156)
    at com.google.protobuf.GeneratedMessageV3.getAllFieldsMutable(GeneratedMessageV3.java:140)
    at com.google.protobuf.GeneratedMessageV3.getAllFields(GeneratedMessageV3.java:216)
    at com.google.protobuf.TextFormat$Printer.print(TextFormat.java:293)
    at com.google.protobuf.TextFormat$Printer.access$000(TextFormat.java:278)
    at com.google.protobuf.TextFormat.print(TextFormat.java:67)
    at com.google.protobuf.TextFormat.printToString(TextFormat.java:134)
    at com.google.protobuf.AbstractMessage.toString(AbstractMessage.java:111)
    at java.base/java.lang.String.valueOf(String.java:3042)
    at java.base/java.io.PrintStream.println(PrintStream.java:897)

[lperron]

can you try running the examples ?
Laurent Perron | Operations Research | [email protected] | (33) 1 42 68 53
00

Le mar. 10 déc. 2019 à 19:42, Lalith Suresh [e-mail] a
écrit :

I'm on or-tools 7.4 on the java version, using the cp-sat solver. Invoking
CpModel.model() (or any other way to access the underlying proto) throws
the below exception.

Adding the protobuf-java 3.9.0 or 3.10.0 dependencies to my build doesn't
seem to fix the problem. Any idea what dependency I'm missing here?

java.lang.NoClassDefFoundError: com/google/protobuf/AbstractMessageLite$InternalOneOfEnum

at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:151)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:802)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:700)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:623)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
at java.base/java.lang.Class.getDeclaredMethods0(Native Method)
at java.base/java.lang.Class.privateGetDeclaredMethods(Class.java:3172)
at java.base/java.lang.Class.getMethodsRecursive(Class.java:3313)
at java.base/java.lang.Class.getMethod0(Class.java:3299)
at java.base/java.lang.Class.getMethod(Class.java:2112)
at com.google.protobuf.GeneratedMessageV3.getMethodOrDie(GeneratedMessageV3.java:1752)
at com.google.protobuf.GeneratedMessageV3.access$1000(GeneratedMessageV3.java:79)
at com.google.protobuf.GeneratedMessageV3$FieldAccessorTable$RepeatedMessageFieldAccessor.(GeneratedMessageV3.java:2742)
at com.google.protobuf.GeneratedMessageV3$FieldAccessorTable.ensureFieldAccessorsInitialized(GeneratedMessageV3.java:1867)
at com.google.ortools.sat.CpModelProto.internalGetFieldAccessorTable(CpModelProto.java:156)
at com.google.protobuf.GeneratedMessageV3.getAllFieldsMutable(GeneratedMessageV3.java:140)
at com.google.protobuf.GeneratedMessageV3.getAllFields(GeneratedMessageV3.java:216)
at com.google.protobuf.TextFormat$Printer.print(TextFormat.java:293)
at com.google.protobuf.TextFormat$Printer.access$000(TextFormat.java:278)
at com.google.protobuf.TextFormat.print(TextFormat.java:67)
at com.google.protobuf.TextFormat.printToString(TextFormat.java:134)
at com.google.protobuf.AbstractMessage.toString(AbstractMessage.java:111)
at java.base/java.lang.String.valueOf(String.java:3042)
at java.base/java.io.PrintStream.println(PrintStream.java:897)

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[lalithsuresh]

Yes. As with my code, works fine as long as I don't call model.model().

For example, I ran this as a test: https://github.com/google/or-tools/blob/stable/ortools/sat/samples/SimpleSatProgram.java

   @Test
    public void repro() {
        // Create the model.
        // [START model]
        CpModel model = new CpModel();
        // [END model]

        // Create the variables.
        // [START variables]
        int numVals = 3;

        IntVar x = model.newIntVar(0, numVals - 1, "x");
        IntVar y = model.newIntVar(0, numVals - 1, "y");
        IntVar z = model.newIntVar(0, numVals - 1, "z");
        // [END variables]

        // Create the constraints.
        // [START constraints]
        model.addDifferent(x, y);
        // [END constraints]

        // Create a solver and solve the model.
        // [START solve]
        CpSolver solver = new CpSolver();
        CpSolverStatus status = solver.solve(model);
        // [END solve]

        System.out.println(model.model());  // <----- exception thrown here

        if (status == CpSolverStatus.FEASIBLE) {
            System.out.println("x = " + solver.value(x));
            System.out.println("y = " + solver.value(y));
            System.out.println("z = " + solver.value(z));
        }
    }

[lperron]

Java is 64 bit ?

[lalithsuresh]

Yes.

$: java -version
openjdk version "12.0.1" 2019-04-16
OpenJDK Runtime Environment (build 12.0.1+12)
OpenJDK 64-Bit Server VM (build 12.0.1+12, mixed mode, sharing)

[lperron]

Can you try an older version of java ?
Laurent Perron | Operations Research | [email protected] | (33) 1 42 68 53
00

Le jeu. 19 déc. 2019 à 22:10, Lalith Suresh [e-mail] a
écrit :

Yes.

$: java -version
openjdk version "12.0.1" 2019-04-16
OpenJDK Runtime Environment (build 12.0.1+12)
OpenJDK 64-Bit Server VM (build 12.0.1+12, mixed mode, sharing)

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[lalithsuresh]

Found the bug. It had to do with the protobuf version on the classpath. I'm on or-tools 7.5 now, where bumping the version to 3.10.0 from 3.8.0 worked.

Thanks!