import org.activiti.engine.impl.variable.StringType; //导入依赖的package包/类
@Override
public void configure(ProcessEngineConfigurationImpl processEngineConfiguration)
{
    // There is an issue when using Activiti with Oracle. When workflow variables have a length greater then 2000 and smaller than 4001,
    // Activiti tries to store that as a String column, but the Oracle database column length (ACT_RU_VARIABLE.TEXT_, ACT_HI_VARINST.TEXT_) is 2000.
    // Since Activiti uses NVARCHAR as the column type which requires 2 bytes for every character, the maximum size Oracle allows for the column is
    // 2000 (i.e. 4000 bytes).

    // Replace the StringType and LongType to store greater than 2000 length variables as blob.
    VariableTypes variableTypes = processEngineConfiguration.getVariableTypes();

    VariableType stringType = new StringType(2000);
    int indexToInsert = replaceVariableType(variableTypes, stringType, 0);

    VariableType longStringType = new LongStringType(2001);
    replaceVariableType(variableTypes, longStringType, ++indexToInsert);
}
 

import org.activiti.engine.impl.variable.StringType; //导入依赖的package包/类
/**
 * Activiti by default configures StringType and LongStringType VariableType in configuration.
 * This method tests the scenarios where no StringType and LongStringType is already configured in configuration.
 */
@Test
public void testNoStringAndLongStringType() throws Exception
{
    SpringProcessEngineConfiguration configuration = new SpringProcessEngineConfiguration();
    configuration.setVariableTypes(new DefaultVariableTypes());
    
    herdProcessEngineConfigurator.configure(configuration);
    VariableType type = configuration.getVariableTypes().findVariableType(StringUtils.repeat("a", 2000));
    assertEquals(StringType.class, type.getClass());
    
    type = configuration.getVariableTypes().findVariableType(StringUtils.repeat("a", 2001));
    assertEquals(LongStringType.class, type.getClass());
}