Spring dao class not found org.springframework.dao.DuplicateKeyException

问题

I am trying to use a jdbcTemplate.query and I get the class not found error. I am using spring-dao 2.0.8 and looked inside the library and couldn't find any DuplicateKeyException class indeed. From maven repository this seems to be the latest release for spring-dao.

The code where I am getting the error is:

ResultSet resultSet = (ResultSet)jdbcTemplate.query (query, new ResultSetExtractor<ResultSet>() {
            @Override
            public ResultSet extractData(ResultSet rs) throws SQLException, DataAccessException {
                return rs;
            }
        });

And the stack:

Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/dao/DuplicateKeyException
    at org.springframework.jdbc.support.JdbcAccessor.getExceptionTranslator(JdbcAccessor.java:99)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:407)
    at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:456)
    at DAO.MySQLAccess.getAccounts(MySQLAccess.java:95)
Caused by: java.lang.ClassNotFoundException: org.springframework.dao.DuplicateKeyException
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    ... 7 more

Isn't this the latest release or why is it giving the error in the first place?

回答1:

Sounds like you have a jar missing from the classpath. I guess you're not using maven.

I searched for jars containing this class and came up with this.
http://mavenhub.com/c/org/springframework/dao/DuplicateKeyException/jar

Looks like you need the org.springframework.transaction jar. Or use maven and it should work out your dependencies for you.

来源：https://stackoverflow.com/questions/20499200/spring-dao-class-not-found-org-springframework-dao-duplicatekeyexception

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java

Spring

classnotfoundexception