I'm trying to add some support for business objects to the Tutorial
(instead of just flowing the catalog and cart items as strings).
My business objects are simple JavaBeans with an empty constructor. I
need to flow them as Java objects through local service calls, XML (in
Atom payloads) and JSON.
It should have been a simple exercise, but I've been running into a
number of issues with the DataBinding framework. Here they are:
1. Some of the Bean2* and *2Bean transformers were missing to
META-INF/services I added them.
2. The Databinding framework was not finding the transformers in XML <->
registrations. I changed all instances of java.lang.String to xml.string
in the registrations of the *2String and String2* transformer to fix that.
3. Next I ran into a ClassCastException in XML2JavaBeanTransformer at
public Object transform(T source, TransformationContext context) {
- -> XMLType xmlType = (XMLType)
context.getSourceDataType().getLogical();
as the logical type was Class instead of XMLType
4. I had to add "implements Serializable" to my business object class as
it looks like we are using Java serialization to enforce pass by value
in local service calls. I don't think it's right as we are not using
Java serialization to pass the same business object through a remote
call. We should change to use the same XML transformation to enforce
pass by value with local calls as well, and not require the business
objects to be Serializable.
5. After changes (1), (2), (3) and (4) I am now running into a build issue:
testTransform1(org.apache.tuscany.sca.databinding.impl.MediatorImplTestCase)
Time elapsed: 0.02 sec <<< ERROR!
java.lang.ClassCastException:
org.apache.tuscany.sca.databinding.DefaultTransformerExtensionPoint$LazyPullTransformer
cannot be cast to org.apache.tuscany.sca.databinding.DataPipeTransformer
at
org.apache.tuscany.sca.databinding.impl.MediatorImpl.mediate(MediatorImpl.java:75)
at
org.apache.tuscany.sca.databinding.impl.MediatorImplTestCase.testTransform1(MediatorImplTestCase.java:104)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at junit.framework.TestCase.runTest(TestCase.java:168)
at junit.framework.TestCase.runBare(TestCase.java:134)
at junit.framework.TestResult$1.protect(TestResult.java:110)
at junit.framework.TestResult.runProtected(TestResult.java:128)
at junit.framework.TestResult.run(TestResult.java:113)
at junit.framework.TestCase.run(TestCase.java:124)
at junit.framework.TestSuite.runTest(TestSuite.java:232)
at junit.framework.TestSuite.run(TestSuite.java:227)
at
org.junit.internal.runners.OldTestClassRunner.run(OldTestClassRunner.java:35)
at
org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:62)
at
org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:138)
at
org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:125)
at org.apache.maven.surefire.Surefire.run(Surefire.java:132)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:299)
at
org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:837)
I'm getting to the end of the rope here... does anyone know what can
cause error (5)?
Thanks
--
Jean-Sebastien
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