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Thanks for the answers. But what I do is more complicated. I use DefaultMigrationHandler from external code. My definitions have the different names and the second has not migration tag. Here is my testcase that represent my use case (simplified):

    public void testMigrateRunning()
      {
        deployJpdlClasspath("org/uni/stuttgart/iaas/fragments/test/a.jpdl.xml");

        ProcessInstance processInstance = executionService
            .startProcessInstanceById("a-1");
        assertTrue(processInstance.isActive("a"));

        String id = processInstance.getId();
        processInstance = executionService.signalExecutionById(id);
        assertTrue(processInstance.isActive("x"));

        deployJpdlClasspath("org/uni/stuttgart/iaas/fragments/test/b.jpdl.xml");

        processInstance = executionService.signalExecutionById(id);
        assertTrue(processInstance.isActive("b"));
        processInstance = executionService.signalExecutionById(id);
        assertTrue(processInstance.isEnded());
      }

    public void testMigrateRunningIntern()
      {
        deployJpdlClasspath("org/uni/stuttgart/iaas/fragments/test/a.jpdl.xml");

        ProcessInstance processInstance = executionService
            .startProcessInstanceById("a-1");
        assertTrue(processInstance.isActive("a"));

        String id = processInstance.getId();
        processInstance = executionService.signalExecutionById(id);
        assertTrue(processInstance.isActive("x"));

        String deploymentId = deployJpdlClasspath("org/uni/stuttgart/iaas/fragments/test/c.jpdl.xml");
        // Get new process definition
        ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery().deploymentId(
            deploymentId).uniqueResult();
        assertTrue(processDefinition.getName().equalsIgnoreCase("c"));
        // Migrate instance here
        new DefaultMigrationHandler().migrateInstance(processDefinition, processInstance, new MigrationDescriptor());

        processInstance = executionService.signalExecutionById(id);
        assertTrue(processInstance.isActive("b"));
        processInstance = executionService.signalExecutionById(id);
        assertTrue(processInstance.isEnded());
      }

The first test is ok, the second is failed.

jpdl definition a:

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

<process name="a" xmlns="http://jbpm.org/4.3/jpdl">

  <start g="11,99,48,48" name="s">
     <transition to="a"/>
  </start>

  <state g="106,94,110,52" name="a">
    <transition to="x"/>
  </state>

  <state g="279,176,110,52" name="x">
    <transition to="e"/>
  </state>

  <end g="499,99,48,48" name="e"/>

</process>

jpdl definition b:

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

<process name="a" xmlns="http://jbpm.org/4.3/jpdl">

  <start g="11,99,48,48" name="s">
     <transition to="a"/>
  </start>

  <state g="106,94,110,52" name="a">
    <transition to="x"/>
  </state>

  <state g="234,185,110,52" name="x">
    <transition to="b"/>
  </state>

  <state g="371,92,110,52" name="b">
    <transition to="e"/>
  </state>

  <end g="549,92,48,48" name="e"/>
  <migrate-instances/>
</process>

jpdl definition c:

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

<process name="c" xmlns="http://jbpm.org/4.3/jpdl">

  <start g="11,99,48,48" name="s">
     <transition to="a"/>
  </start>

  <state g="106,94,110,52" name="a">
    <transition to="x"/>
  </state>

  <state g="234,185,110,52" name="x">
    <transition to="b"/>
  </state>

  <state g="371,92,110,52" name="b">
    <transition to="e"/>
  </state>

  <end g="549,92,48,48" name="e"/>

</process>

Any help would be appreciated.