How to skip the exception and drop off bad input data on BRMS / BPM Suite execution server side ?

Issue

Our application sends aggregated data(XML format) to execution server and fire the rules every 5 seconds. Sometimes the xml contains invalid data entries, execution server will throw exceptions and we will lose all the data (even the good ones aggregated in 5 seconds) in the above situation. Could you explain how to skip the invalid data entries in the xml input ?

Our rules look like:

package org.kie.example.project1;

declare TestVO
    @role(event)
    cnt : int
    name : String
end

rule "test"
when
    TestVO( name == "test", cnt > 0 )
then
    System.out.println("test");
end

We invoke execution server with REST requests containing following data:

<batch-execution lookup="infoSession">
  <insert>
    <org.kie.example.project1.TestVO>
      <name>test</name>
      <cnt>1</cnt>
    </org.kie.example.project1.TestVO>
  </insert>

  <insert>
    <org.kie.example.project1.TestVO>
      <name>test</name>
      <cnt>aaa</cnt>
    </org.kie.example.project1.TestVO>
  </insert>
  <fire-all-rules />
</batch-execution>

And converting the cnt variable which has the value aaa will lead to ConversionException:

<?xml version="1.0" encoding="UTF-8"?>

<response type="FAILURE" msg="Error calling container window: com.thoughtworks.xstream.converters.ConversionException: For input string: &quot;aaa&quot; : For input string: &quot;aaa&quot;
---- Debugging information ----
message             : For input string: &quot;aaa&quot;
cause-exception     : java.lang.NumberFormatException
cause-message       : For input string: &quot;aaa&quot;
class               : java.lang.Integer
required-type       : java.lang.Integer
converter-type      : com.thoughtworks.xstream.converters.SingleValueConverterWrapper
wrapped-converter   : com.thoughtworks.xstream.converters.basic.IntConverter
path                : /batch-execution/insert[2]/org.kie.example.project1.TestVO/cnt
line number         : 1
class[1]            : org.kie.example.project1.TestVO
converter-type[1]   : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
class[2]            : org.drools.core.command.runtime.rule.InsertObjectCommand
converter-type[2]   : org.drools.core.runtime.help.impl.XStreamXML$InsertConverter
class[3]            : org.drools.core.command.runtime.BatchExecutionCommandImpl
version             : 1.4.7