"Error on unmarshalling content" on OrientGraph.removeVertex() using custom type

[FP]

• I'm using OrientDB version 1.7.6.
  

• I have a java.awt.Color as an attribute for an Entity, so I created OSerializableColor which simply extends Color and implements OSerializableStream (code is attached below).
  
• There doesn't seem to be any problem storing and retrieving the entities that have this attribute (using entityVertex.setProperty("colour", new OSerializableColor(entity.getColour())); and OSerializableColor color = vertex.getProperty("colour"); etc.). I tested this by creating the entities in the DB and then by retrieving and using them.
• However, when I retrieve only the vertex that corresponds to such an entity from the DB and then request to delete it like this:

    protected OrientGraph db;

    ...

    @Override

    public void delete(T entity) {

        Vertex v = getVertexForEntity(entity);

        if (v != null) {

            db.removeVertex(v);

            db.commit();

        }

    }

    ...

    protected Vertex getVertexForEntity(T entity) {
        if (entity == null || entity.getID() == null)
            return null;
        Iterator<Vertex> iter = db.getVertices(dbClassName + ".ID",
                entity.getID()).iterator();
        if (!iter.hasNext())
            return null;
        return iter.next();
    }

then db.removeVertex(v); throws:

 

SEVERE: Error on unmarshalling content. Class: com.github.bfour.fpliteraturecollector.service.database.DAO.OSerializableColor

java.lang.InstantiationException: com.github.bfour.fpliteraturecollector.service.database.DAO.OSerializableColor

    at java.lang.Class.newInstance0(Class.java:357)

    at java.lang.Class.newInstance(Class.java:325)

    at com.orientechnologies.orient.core.serialization.serializer.string.OStringSerializerAnyStreamable.fromStream(OStringSerializerAnyStreamable.java:48)

    at com.orientechnologies.orient.core.serialization.serializer.record.string.ORecordSerializerStringAbstract.fieldTypeFromStream(ORecordSerializerStringAbstract.java:87)

    at com.orientechnologies.orient.core.serialization.serializer.record.string.ORecordSerializerCSVAbstract.fieldFromStream(ORecordSerializerCSVAbstract.java:249)

    at com.orientechnologies.orient.core.serialization.serializer.record.string.ORecordSerializerSchemaAware2CSV.fromString(ORecordSerializerSchemaAware2CSV.java:242)

    at com.orientechnologies.orient.core.serialization.serializer.record.string.ORecordSerializerStringAbstract.fromStream(ORecordSerializerStringAbstract.java:661)

    at com.orientechnologies.orient.core.record.ORecordSchemaAwareAbstract.deserializeFields(ORecordSchemaAwareAbstract.java:436)

    at com.orientechnologies.orient.core.record.impl.ODocument.deserializeFields(ODocument.java:1510)

    at com.tinkerpop.blueprints.impls.orient.OrientElement.checkClass(OrientElement.java:427)

    at com.tinkerpop.blueprints.impls.orient.OrientVertex.remove(OrientVertex.java:532)

    at com.tinkerpop.blueprints.impls.orient.OrientBaseGraph.removeVertex(OrientBaseGraph.java:574)

    at com.github.bfour.fpliteraturecollector.service.database.OrientDBGraphService.deleteAllDataInCurrentDB(OrientDBGraphService.java:145)

    at com.github.bfour.fpliteraturecollector.service.ServiceManager.resetAllData(ServiceManager.java:111)

    at com.github.bfour.fpliteraturecollector.test.TagTest.post(TagTest.java:35)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:601)

    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)

    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)

    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:33)

    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)

    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)

    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)

    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)

    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)

    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)

    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)

    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)

    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)

    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)

    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)

    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)

    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

Code of custom java.awt.Color implementation:

import java.awt.Color;
import java.awt.color.ColorSpace;
import java.nio.ByteBuffer;


import com.orientechnologies.orient.core.exception.OSerializationException;
import com.orientechnologies.orient.core.serialization.OSerializableStream;


public class OSerializableColor extends Color implements OSerializableStream {


    private static final long serialVersionUID = -4948645118483624549L;


    public OSerializableColor(ColorSpace instance, float[] components,
            int alpha) {
        super(instance, components, alpha/255);
    }


    public OSerializableColor(Color color) {
        this(color.getColorSpace(), color.getComponents(null),
                color.getAlpha());
    }


    @Override
    public byte[] toStream() throws OSerializationException {
        int colorSpace = getColorSpace().getType();
        float[] components = getComponents(null);
        int alpha = getAlpha();
        ByteBuffer buffer = ByteBuffer.allocate(4 + components.length * 4 + 4);
        buffer.putInt(colorSpace);
        buffer.putInt(alpha);
        for (float component : components) {
            buffer.putFloat(component);
        }
        return buffer.array();
    }


    @Override
    public OSerializableStream fromStream(byte[] bytes)
            throws OSerializationException {
        ByteBuffer buffer = ByteBuffer.wrap(bytes);
        int colorSpace = buffer.getInt();
        int alpha = buffer.getInt();
        ByteBuffer componentsBuffer = buffer.slice();
        float[] components = new float[componentsBuffer.remaining()];
        int counter = 0;
        while (componentsBuffer.hasRemaining()) {
            components[counter] = componentsBuffer.getFloat();
            counter++;
        }
        return new OSerializableColor(ColorSpace.getInstance(colorSpace),
                components, alpha);
    }


}

[Emanuel]

O think you need the default constructor.

bye

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