Once nuisance of working with the JavaBeanConverter is that it appears to
have different naming requirements than the default converter.
For example, I have a class which is defined like:
-------------------------- BEGIN ---------------------------------
public class Se3_F64 {
public DenseMatrix64F R;
public Vector3D_F64 T;
public void setR(DenseMatrix64F R){...}
public void setT(Vector3D_F64 T){...}
public DenseMatrix64F getR(){...}
public Vector3D_F64 getT(){...}
}
---------------------------- END ----------------------------------
and in the past was serialized (insider another object) as follows:
-------------------------- BEGIN ---------------------------------
<rightToLeft>
<R>
<numRows>3</numRows>
<numCols>3</numCols>
<data>
<double>1.0</double>
<double>0.0</double>
<double>0.0</double>
<double>0.0</double>
<double>1.0</double>
<double>0.0</double>
<double>0.0</double>
<double>0.0</double>
<double>1.0</double>
</data>
</R>
<T>
<x>0.07</x>
<y>0.0</y>
<z>0.0</z>
</T>
</rightToLeft>
---------------------------- END ----------------------------------
where rightToLeft is an object of type Se3_F64.
If I try to deserialize the object with the following
-------------------------- BEGIN ---------------------------------
XStream xstream = new XStream(new PureJavaReflectionProvider(),new
XppDriver(),
new ClassLoaderReference(UtilIO.class.getClassLoader()));
xstream.registerConverter(new
JavaBeanConverter(xstream.getMapper()));
---------------------------- END ----------------------------------
it will fail with the error message shown below. However, if I comment out
the new JavaBeanConverter() line it will parse it just fine. A fix to get
around this issue is to modify the XML so that <R></R> becomes <r></r> and
similar for <T>. This can be a bit annoying, but it becomes very annoying
if other people try to parse my serialized objects in their code and don't
realize that you need to use the JavaBeanConverter.
-------------------------- BEGIN ---------------------------------
Exception in thread "Thread-1"
com.thoughtworks.xstream.converters.ConversionException: No field 'R' found
in class 'georegression.struct.se.Se3_F64' : No field 'R' found in class
'georegression.struct.se.Se3_F64'
---- Debugging information ----
message : No field 'R' found in class
'georegression.struct.se.Se3_F64'
cause-exception :
com.thoughtworks.xstream.converters.reflection.MissingFieldException
cause-message : No field 'R' found in class
'georegression.struct.se.Se3_F64'
class : georegression.struct.se.Se3_F64
required-type : georegression.struct.se.Se3_F64
converter-type :
com.thoughtworks.xstream.converters.javabean.JavaBeanConverter
path : /boofcv.struct.calib.StereoParameters/rightToLeft/R
line number : 31
class[1] : boofcv.struct.calib.StereoParameters
version : 1.4.7
-------------------------------
at
com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:79)
at
com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
at
com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at
com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
at
com.thoughtworks.xstream.converters.javabean.JavaBeanConverter.unmarshal(JavaBeanConverter.java:134)
at
com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
at
com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
at
com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at
com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
at
com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134)
at
com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1185)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1169)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1040)
at boofcv.io.UtilIO.loadXML(UtilIO.java:157)
at
boofcv.alg.geo.rectify.ShowRectifyCalibratedApp.changeInput(ShowRectifyCalibratedApp.java:154)
at
boofcv.gui.SelectAlgorithmAndInputPanel.performChangeInput(SelectAlgorithmAndInputPanel.java:326)
at
boofcv.gui.SelectAlgorithmAndInputPanel.access$200(SelectAlgorithmAndInputPanel.java:44)
at
boofcv.gui.SelectAlgorithmAndInputPanel$8.run(SelectAlgorithmAndInputPanel.java:300)
Caused by:
com.thoughtworks.xstream.converters.reflection.MissingFieldException: No
field 'R' found in class 'georegression.struct.se.Se3_F64'
at
com.thoughtworks.xstream.converters.javabean.PropertyDictionary.propertyDescriptor(PropertyDictionary.java:98)
at
com.thoughtworks.xstream.converters.javabean.BeanProvider.getProperty(BeanProvider.java:186)
at
com.thoughtworks.xstream.converters.javabean.BeanProvider.propertyDefinedInClass(BeanProvider.java:134)
at
com.thoughtworks.xstream.converters.javabean.JavaBeanConverter.unmarshal(JavaBeanConverter.java:130)
at
com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
... 18 more
--
"Now, now my good man, this is no time for making enemies." — Voltaire
(1694-1778), on his deathbed in response to a priest asking that he
renounce Satan.
