出现 java.math.BigInteger cannot be cast to java.lang.Long解决办法

最新推荐文章于 2024-05-06 18:35:17 发布

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最新推荐文章于 2024-05-06 18:35:17 发布

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文章标签： java 数据库 json

原文链接：http://www.cnblogs.com/pandazhao/p/10948822.html

博客展示了Java连接MySQL数据库时出现的类型转换异常，即java.math.BigInteger无法转换为java.lang.Long的错误堆栈信息。同时给出了解决办法，将数据库查出的数据先转为Number，再取long值，如(Number)(result).LongValue。

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出现 java.math.BigInteger cannot be cast to java.lang.Long解决办法

java.sql.SQLException: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:920)
    at com.mysql.jdbc.ConnectionImpl.buildCollationMapping(ConnectionImpl.java:1074)
    at com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3590)
    at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2531)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2301)
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:317)
    at java.sql.DriverManager.getConnection(DriverManager.java:571)
    at java.sql.DriverManager.getConnection(DriverManager.java:215)
    at zttc.itat.user.util.DbUtil.getConnection(DbUtil.java:12)
    at zttc.itat.user.util.AbstractDbUnitTestCase.init(AbstractDbUnitTestCase.java:28)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)