I have a class which extends treeitem：
import com.google.gwt.user.client.ui.TreeItem;
public class TreeNode extends TreeItem
{
String id;
String parentId;
String type;
int idx;
String name;
String description;
String code;
// action is a reserved word
String operation;
String target;
Boolean enabled;
public TreeNode(String html)
{
super(html);
}
public String getId()
{
return id;
}
。。。。。。。
}
and write a custom field serializer:
public class TreeNode_CustomFieldSerializer
{
public static TreeNode instantiate(
SerializationStreamReader streamReader)
throws SerializationException
{
String html=streamReader.readString();
return new TreeNode(html);
}
public static void serialize(SerializationStreamWriter streamWriter,
TreeNode instance) throws SerializationException
{
streamWriter.writeString(instance.id);
....
}
public static void deserialize(SerializationStreamReader
streamReader,
TreeNode instance) throws SerializationException
{
instance.id= streamReader.readString();
.....
}
}
and I want to transmit it between client and server,but got an
exception:
----------------------------------------------------------------------------------
Caused by: java.lang.ExceptionInInitializerError: null
at
com.tsolution.emc.client.gui.tree.TreeNode_CustomFieldSerializer.instantiate(TreeNode_CustomFieldSerializer.java:14)
the Line 14 is:
return new TreeNode(html);
What is this problem?How can I fix it?
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------
Detailed exception:
[WARN] StandardContext[]An IncompatibleRemoteServiceException was thrown
while processing this call.
com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException:
java.lang.reflect.InvocationTargetException
....
Caused by: com.google.gwt.user.client.rpc.SerializationException:
java.lang.reflect.InvocationTargetException
....
Caused by: java.lang.reflect.InvocationTargetException: null
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
.....
Caused by: java.lang.ExceptionInInitializerError: null
at
com.tsolution.emc.client.gui.tree.TreeNode_CustomFieldSerializer.instantiate(TreeNode_CustomFieldSerializer.java:14)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
........
Caused by: java.lang.UnsupportedOperationException: ERROR: GWT.create()
is only usable in client code! It cannot be called, for example, from
server code. If you are running a unit test, check that your test case
extends GWTTestCase and that GWT.create() is not called from within an
initializer or constructor.
at com.google.gwt.core.client.GWT.create(GWT.java:91)
......
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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