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Hi Tim,

the TEXT_VALUE_ column is for char[], the test case goes like this:

public void testCharsVariable() {
    ExecutionImpl execution = startProcessInstance();
    char[] chars = generateChars("a lot of bytes ", 500);
    assertTrue(chars.length>4500);
    execution.setVariable("v", chars);
    Variable variable = execution.getVariableObject("v");
    assertEquals(TextVariable.class, variable.getClass());
    assertTrue(Arrays.equals(chars, (char[]) execution.getVariable("v")));
  }

if you want to extend the size for the STRING_VALUE_ column, it is configured in

jbpm.execution.hbm.xml:

<subclass name="org.jbpm.pvm.internal.type.variable.StringVariable" extends="org.jbpm.pvm.internal.type.Variable" discriminator-value="string">
    <property name="string" column="STRING_VALUE_" type="string"/>
</subclass>