Caused by: org.codehaus.jackson.map.JsonMappingException

本文分析了使用Hibernate框架时出现的Lazy加载异常原因,并提供了解决方案,通过使用Jackson库和注解@JsonIgnoreProperties来排除特定属性,避免异常发生。
写道
No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: ***************_$$_javassist_15["hibernateLazyInitializer"])

后来google发现在je上有人有类似的问题:http://147175882.iteye.com/blog/380823

 

147175882 写道
分析原因,是因为jsonplugin用的是java的内审机制.hibernate会给被管理的pojo加入一个hibernateLazyInitializer属性,jsonplugin会把hibernateLazyInitializer也拿出来操作,并读取里面一个不能被反射操作的属性就产生了这个异常.

 

 

不过我用的是jackson来转json,所以想到了用annotation来排除hibernateLazyInitializer 这个属性

在你的pojo类声明加上:

 

@JsonIgnoreProperties(value={"hibernateLazyInitializer"})  
@JsonIgnoreProperties(value={"hibernateLazyInitializer"})

 

既可以

va.lang.RuntimeException: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while processing row at org.apache.hadoop.hive.ql.exec.mr.ExecMapper.map(ExecMapper.java:163) at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54) at org.apache.hadoop.hive.ql.exec.mr.ExecMapRunner.run(ExecMapRunner.java:37) at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:466) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:350) at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:178) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1878) at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:172) Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while processing row at org.apache.hadoop.hive.ql.exec.vector.VectorMapOperator.process(VectorMapOperator.java:973) at org.apache.hadoop.hive.ql.exec.mr.ExecMapper.map(ExecMapper.java:154) ... 9 more Caused by: org.apache.hadoop.hive.serde2.SerDeException: org.codehaus.jackson.JsonParseException: Illegal character ((CTRL-CHAR, code 31)): only regular white space (\r, \n, \t) is allowed between tokens at [Source: java.io.ByteArrayInputStream@4a67b4ec; line: 1, column: 2] at org.apache.hadoop.hive.serde2.JsonSerDe.deserialize(JsonSerDe.java:165) at org.apache.hadoop.hive.ql.exec.vector.VectorMapOperator.process(VectorMapOperator.java:936) ... 10 more Caused by: org.codehaus.jackson.JsonParseException: Illegal character ((CTRL-CHAR, code 31)): only regular white space (\r, \n, \t) is allowed between tokens at [Source: java.io.ByteArrayInputStream@4a67b4ec; line: 1, column: 2] at org.codehaus.jackson.JsonParser._constructError(JsonParser.java:1433) at org.codehaus.jackson.impl.JsonParserMinimalBase._reportError(JsonParserMinimalBase.java:521) at org.codehaus.jackson.impl.JsonParserMinimalBase._throwInvalidSpace(JsonParserMinimalBase.java:467) at org.codehaus.jackson.impl.Utf8StreamParser._skipWSOrEnd(Utf8StreamParser.java:2322) at org.codehaus.jackson.impl.Utf8StreamParser.nextToken(Utf8StreamParser.java:444) at org.apache.hadoop.hive.serde2.JsonSerDe.deserialize(JsonSerDe.java:155) ... 11 more FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask
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