Wild guess.... you are trying to serialize (with JSON plugin) a
Hibernate proxy object.
Maybe your object has a reference to another lazy loaded object or collection.
Using reflection on a proxy object is usually a bad idea.
You may need to clone the object (to get a real one) first before
serializing it with JSON.
Greg
On Mon, Dec 14, 2009 at 3:45 PM, Timothy Orme
<to...@genome.med.harvard.edu> wrote:
> Hello,
>
> I just recently switched to c3p0 and it fixed some other issues I was
> having with dbcp, but another has arisen.
> It seems to be a combination of using the c3p0 data source along with the
> JSON plugin. Here's my (slightly shortened) stacktrace:
>
> Caused by: org.apache.struts2.json.JSONException:
> org.apache.struts2.json.JSONException:
> org.apache.struts2.json.JSONException:
> java.lang.reflect.InvocationTargetException
> at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:243)
> at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:165)
> at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
> at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:329)
> at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:228)
> ... 91 more
> Caused by: org.apache.struts2.json.JSONException:
> org.apache.struts2.json.JSONException:
> java.lang.reflect.InvocationTargetException
> at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:243)
> at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:165)
> at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
> at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:329)
> at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:228)
> ... 95 more
> Caused by: org.apache.struts2.json.JSONException:
> java.lang.reflect.InvocationTargetException
> at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:243)
> at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:165)
> at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
> at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:329)
> at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:228)
> ... 99 more
> Caused by: java.lang.reflect.InvocationTargetException
> 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.struts2.json.JSONWriter.bean(JSONWriter.java:227)
> ... 103 more
> Caused by: java.sql.SQLException: Unsupported feature: getCursorName
> at
> oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
> at
> oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
> at oracle.jdbc.driver.BaseResultSet.getCursorName(BaseResultSet.java:37)
> at
> com.mchange.v2.c3p0.impl.NewProxyResultSet.getCursorName(NewProxyResultSet.java:545)
> ... 108 more
>
> I'm runing c3p0-0.9.1.2, struts 2.1.8.1 and its corresponding json plugin,
> Oracle 10, and Hibernate 3.3.1.GA
>
> Heres my datasource in spring. Just using the defaults:
>
> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
> <property name="driverClass" value="${database.driver}" />
> <property name="jdbcUrl" value="${database.connectionString}" />
> <property name="user" value="${database.username}" />
> <property name="password" value="${database.password}" />
> </bean>
>
> Should note that other pages seem to work fine and lazy load as well. Just
> this json action is giving me problems. If you need more info let me know.
>
> Thanks!
> -Tim
>
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