序列化抛出警告: Hessian/Burlap: 'com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException

警告: Hessian/Burlap: 'com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException' is an unknown class in WebappClassLoader
  context: 
  delegate: false
  repositories:
----------> Parent Classloader:
ClassRealm[plugin>org.apache.tomcat.maven:tomcat7-maven-plugin:2.2, parent: sun.misc.Launcher$AppClassLoader@18b4aac2]
:
java.lang.ClassNotFoundException: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException

找到抛出对应错误的代码片段,如下

        if (type.startsWith("[")) {
            Deserializer subDeserializer = getDeserializer(type.substring(1));

            if (subDeserializer != null)
                deserializer = new ArrayDeserializer(subDeserializer.getType());
            else
                deserializer = new ArrayDeserializer(Object.class);
        } else {
            try {
                Class cl = Class.forName(type, false, _loader);
                deserializer = getDeserializer(cl);
            } catch (Exception e) {
                log.warning("Hessian/Burlap: '" + type + "' is an unknown class in " + _loader + ":\n" + e);
                log.log(Level.FINER, e.toString(), e);
            }
        }

Class cl = Class.forName(type, false, _loader);
deserializer = getDeserializer(cl);
分析:以上两行代码中有抛出异常,但forName抛出完整异常,说明参数完整

java.lang.ClassNotFoundException: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException