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javacassandradeserializationniodatastax-java-driver

How to deserialize a java.nio.ByteBuffer in Java

I converted an object to json String and storing it as Blob in Datastax using ByteBuffer.wrap(attributes.getBytes()). How can I convert that back to String and assert in my tests? I tried using org.apache.commons.lang3.SerializationUtils.deserialize(entity.getAttributes().array()) but getting an exception

org.apache.commons.lang3.SerializationException: java.io.StreamCorruptedException: invalid stream header: 7B226F70

at org.apache.commons.lang3.SerializationUtils.deserialize(SerializationUtils.java:197)
at org.apache.commons.lang3.SerializationUtils.deserialize(SerializationUtils.java:223)
at com.homedepot.productassortment.fullfeed.util.InstallSkusToProductAssortmentConverterTest.convertInstallSkuToProductAssortmentEntity(InstallSkusToProductAssortmentConverterTest.java:50)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Solution

  • You should try something like this :

    byte[] bytes = attributes.getBytes( StandardCharsets.UTF_8 );
ByteBuffer.wrap(bytes);

    I added StandardCharsets.UTF_8 as getBytes() uses the default charset of your platform. then you can get your bytes back with something like :

    String original = new String( entity.getAttributes(), StandardCharsets.UTF_8 );

    In fact I don't know what type is your entity.getAttributes() but if it is a byte[] it should work.