mybatis 并发执行时出现NullPointerException

异常堆栈如下：

### Cause: java.lang.NullPointerException
        at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:23)
        at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:147)
        at org.apache.ibatis.session.defaults.DefaultSqlSession.insert(DefaultSqlSession.java:134)
        at sun.reflect.GeneratedMethodAccessor725.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:355)
        ... 87 more
Caused by: java.lang.NullPointerException
        at org.apache.ibatis.reflection.property.PropertyTokenizer.<init>(PropertyTokenizer.java:27)
        at org.apache.ibatis.reflection.MetaObject.getValue(MetaObject.java:114)
        at org.apache.ibatis.builder.xml.dynamic.DynamicContext$ContextMap.get(DynamicContext.java:89)
        at org.apache.ibatis.builder.xml.dynamic.DynamicContext$ContextAccessor.getProperty(DynamicContext.java:107)
        at org.apache.ibatis.ognl.OgnlRuntime.getProperty(OgnlRuntime.java:1657)
        at org.apache.ibatis.ognl.ASTProperty.getValueBody(ASTProperty.java:92)
        at org.apache.ibatis.ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)
        at org.apache.ibatis.ognl.SimpleNode.getValue(SimpleNode.java:210)
        at org.apache.ibatis.ognl.ASTNotEq.getValueBody(ASTNotEq.java:49)
        at org.apache.ibatis.ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)
        at org.apache.ibatis.ognl.SimpleNode.getValue(SimpleNode.java:210)
        at org.apache.ibatis.ognl.Ognl.getValue(Ognl.java:333)
        at org.apache.ibatis.ognl.Ognl.getValue(Ognl.java:413)
        at org.apache.ibatis.ognl.Ognl.getValue(Ognl.java:395)
        at org.apache.ibatis.builder.xml.dynamic.OgnlCache.getValue(OgnlCache.java:42)
        at org.apache.ibatis.builder.xml.dynamic.ExpressionEvaluator.evaluateBoolean(ExpressionEvaluator.java:32)
        at org.apache.ibatis.builder.xml.dynamic.IfSqlNode.apply(IfSqlNode.java:30)
        at org.apache.ibatis.builder.xml.dynamic.MixedSqlNode.apply(MixedSqlNode.java:29)
        at org.apache.ibatis.builder.xml.dynamic.TrimSqlNode.apply(TrimSqlNode.java:42)
        at org.apache.ibatis.builder.xml.dynamic.MixedSqlNode.apply(MixedSqlNode.java:29)
        at org.apache.ibatis.builder.xml.dynamic.DynamicSqlSource.getBoundSql(DynamicSqlSource.java:37)
        at org.apache.ibatis.mapping.MappedStatement.getBoundSql(MappedStatement.java:241)
        at org.apache.ibatis.executor.statement.BaseStatementHandler.<init>(BaseStatementHandler.java:61)
        at org.apache.ibatis.executor.statement.PreparedStatementHandler.<init>(PreparedStatementHandler.java:36)
        at org.apache.ibatis.executor.statement.RoutingStatementHandler.<init>(RoutingStatementHandler.java:42)
        at org.apache.ibatis.session.Configuration.newStatementHandler(Configuration.java:348)
        at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:43)
        at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:108)
        at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:75)
        at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:145)
        ... 92 more

这是mybatis依赖包OGNL 2.6.9的一个bug，可以通过升级mybatis版本到 3.3.0来解决此问题。

mybatis官方issue说明： https://github.com/mybatis/mybatis-3/issues/224

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