Disabling contextual LOB creation as createClob() method threw error : java.lang
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Disabling contextual LOB creation as createClob() method threw error : java.lang
[摘要:实在只需看第一止就能够了 at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:244) ,便是正在设置装备摆设的时间出与到值。那末为何出]
这问题也困扰了我好几个小时,下面贴出Hibernate的源码来看一下。
大家可以看到,参数在取值的时候,它要先用useJdbcMetadata判断一下,是不是JDBC方式,如果不把这个属性设置为false的话,那么取值必然是取不到了,这就是空指针的原因。
其实只要看第一行就可以了 at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:244) ,就是在配置的时候没取到值。那么为什么没取到值呢,是因为Hibernate默认是使用jdbc方式来取的,如果使用连接池的方式的话,必须告诉Hibernate一声,让它不使用单纯的JDBC连接。加入下面这一句话就可以了。
Disabling contextual LOB creation as createClob() method threw error : java.lang.reflect.Invocation,同样解决办法
- <prop key="hibernate.temp.use_jdbc_metadata_defaults">false</prop>
这问题也困扰了我好几个小时,下面贴出Hibernate的源码来看一下。
package org.hibernate.engine.jdbc.internal;
- // 'hibernate.temp.use_jdbc_metadata_defaults' is a temporary magic value.
- // The need for it is intended to be alleviated with future development, thus it is
- // not defined as an Environment constant...
- //
- // it is used to control whether we should consult the JDBC metadata to determine
- // certain Settings default values; it is useful to *not* do this when the database
- // may not be available (mainly in tools usage).
- final boolean useJdbcMetadata = ConfigurationHelper.getBoolean( "hibernate.temp.use_jdbc_metadata_defaults", configValues, true );
- if ( useJdbcMetadata ) {
- try {
- final Connection connection = jdbcConnectionAccess.obtainConnection();
大家可以看到,参数在取值的时候,它要先用useJdbcMetadata判断一下,是不是JDBC方式,如果不把这个属性设置为false的话,那么取值必然是取不到了,这就是空指针的原因。
PS:以后开源的东西还是要多看看源码
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