问题
I am trying to configure dbcp2 with postgres 9.1
When I run my app, it throws exception:
Exception in thread "main" org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: Cannot create PoolableConnectionFactory (Method org.postgresql.jdbc4.Jdbc4Connection.isValid(int) is not yet implemented.)
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:575)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:639)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:664)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:704)
at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.queryForObject(NamedParameterJdbcTemplate.java:195)
at com.springinpractice.ch02.service.impl.ContactServiceImpl.getContact(ContactServiceImpl.java:64)
at com.springinpractice.ch02.ConsoleApp.main(ConsoleApp.java:16)
Caused by: java.sql.SQLException: Cannot create PoolableConnectionFactory (Method org.postgresql.jdbc4.Jdbc4Connection.isValid(int) is not yet implemented.)
at org.apache.commons.dbcp2.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:2152)
at org.apache.commons.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:1903)
at org.apache.commons.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1413)
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
... 7 more
Caused by: org.postgresql.util.PSQLException: Method org.postgresql.jdbc4.Jdbc4Connection.isValid(int) is not yet implemented.
at org.postgresql.Driver.notImplemented(Driver.java:753)
at org.postgresql.jdbc4.AbstractJdbc4Connection.isValid(AbstractJdbc4Connection.java:109)
at org.postgresql.jdbc4.Jdbc4Connection.isValid(Jdbc4Connection.java:21)
at org.apache.commons.dbcp2.DelegatingConnection.isValid(DelegatingConnection.java:914)
at org.apache.commons.dbcp2.PoolableConnection.validate(PoolableConnection.java:227)
at org.apache.commons.dbcp2.PoolableConnectionFactory.validateConnection(PoolableConnectionFactory.java:303)
at org.apache.commons.dbcp2.BasicDataSource.validateConnectionFactory(BasicDataSource.java:2165)
at org.apache.commons.dbcp2.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:2148)
... 11 more
Here is my maven POM:
<dependencies>
<!-- Spring and Transactions -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring-framework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring-framework.version}</version>
</dependency>
<!-- Logging with SLF4J & LogBack -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>${logback.version}</version>
<scope>runtime</scope>
</dependency>
<!-- Hibernate -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${hibernate.version}</version>
</dependency>
<!-- Test Artifacts -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring-framework.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<!-- For JDBC -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring-framework.version}</version>
</dependency>
<dependency>
<groupId>postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>9.1-901.jdbc4</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-dbcp2</artifactId>
<version>2.0.1</version>
</dependency>
<dependency>
<groupId>javax.inject</groupId>
<artifactId>javax.inject</artifactId>
<version>1</version>
</dependency>
</dependencies>
回答1:
That method is implemented in the current driver version. You must be using an old PgJDBC. Upgrade. It's fully backward compatible. (You should've specified your PgJDBC version in the question).
Separately, though, relying on connection "validation" is usually a bad idea. It's just a way of trying to imperfectly hide a race condition. Simply grab the connection and use it. If there's a problem with it, your application should trap the resulting exception, check the SQLSTATE to see if it's a connection related error, and retry with a new connection.
回答2:
Replace your postgresql with below entry in pom.xml. My Postgress version was postgresql-9.3.10-3.
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>9.3-1100-jdbc41</version>
</dependency>
回答3:
Craig has right. The root cause is postgresql group id changed to org.postgresql and the old group doesn't get the updates. You should refresh your dependency node i.e.:
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>42.2.5</version>
</dependency>
according to the current latest version https://mvnrepository.com/artifact/org.postgresql/postgresql/
回答4:
Solution: Set a validation query for parameter "validationQuery".
E.g for bean: property name="validationQuery" value="SELECT 1"
This validation query is run against the connection before returning it. So have a valid query, above is a dummy one.
https://commons.apache.org/proper/commons-dbcp/configuration.html
回答5:
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>9.3-1100-jdbc41</version>
</dependency>
changed the driver, it works!
回答6:
Maven Central has an old version of the driver under postgresql. Check for org.postgresql.
回答7:
This ticket helped me to solve the issue: Caused by: java.lang.NoSuchMethodError: org.postgresql.core.BaseConnection.getEncoding()Lorg/postgresql/core/Encoding;
Basically, you need to exclude PostGIS stubs:
<dependency>
<groupId>org.postgis</groupId>
<artifactId>postgis-jdbc</artifactId>
<version>1.3.3</version>
<scope>compile</scope>
<exclusions>
<exclusion>
<groupId>org.postgis</groupId>
<artifactId>postgis-stubs</artifactId>
</exclusion>
</exclusions>
</dependency>
回答8:
intelliJ safe definition (which resolves to 9.4.1208-jdbc42-atlassian-hosted)
<dependency>
<groupId>postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>RELEASE</version>
</dependency>
OR:
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>42.2.5.jre7</version>
</dependency>
来源：https://stackoverflow.com/questions/25594279/method-org-postgresql-jdbc4-jdbc4connection-isvalidint-is-not-yet-implemented