相关疑难解决方法(0)

我该如何解决这个错误:

java.lang.reflect.InvocationTargetException: null
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_161]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_161]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_161]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_161]
    at org.hibernate.engine.jdbc.env.internal.LobCreatorBuilderImpl.useContextualLobCreation(LobCreatorBuilderImpl.java:113) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
    at org.hibernate.engine.jdbc.env.internal.LobCreatorBuilderImpl.makeLobCreatorBuilder(LobCreatorBuilderImpl.java:54) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentImpl.<init>(JdbcEnvironmentImpl.java:271) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:114) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
    at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:88) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:259) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:233) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:210) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
    at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:51) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
    at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:94) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:242) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:210) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.handleTypes(MetadataBuildingProcess.java:352) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:111) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:861) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:888) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
    at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:57) [spring-orm-5.0.4.RELEASE.jar:5.0.4.RELEASE]
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) [spring-orm-5.0.4.RELEASE.jar:5.0.4.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:388) [spring-orm-5.0.4.RELEASE.jar:5.0.4.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:377) [spring-orm-5.0.4.RELEASE.jar:5.0.4.RELEASE]
    at …

当我使用连接对象调用createClob方法时,如下所示

Clob clob = con.createClob();

抛出以下异常.

Caused by: java.sql.SQLFeatureNotSupportedException: Method org.postgresql.jdbc.PgConnection.createClob() is not yet implemented.
        at org.postgresql.Driver.notImplemented(Driver.java:659)
        at org.postgresql.jdbc.PgConnection.createClob(PgConnection.java:1246)
        at org.apache.commons.dbcp2.DelegatingConnection.createClob(DelegatingConnection.java:868)
        at org.apache.commons.dbcp2.DelegatingConnection.createClob(DelegatingConnection.java:868)

我正在使用带有JDK8的数据库PostgreSQL 9.6.2并使用commons-dbcp2连接池,并在pom.xml中添加了以下Postgres依赖项

<dependency>
    <groupId>org.postgresql</groupId>
    <artifactId>postgresql</artifactId>
    <version>42.1.1</version>
</dependency>

在类中createClob,createClob实现如下所示,它抛出了异常.

@Override
public Clob createClob() throws SQLException {
    checkClosed();
    throw org.postgresql.Driver.notImplemented(this.getClass(), "createClob()");
}

解决此问题的解决方案或解决方法是什么？或者我们如何在Postgres查询中设置CLOB数据？

在我的项目中,我开始使用c3p0和hibernate重新连接到数据库,因为hibernate不会在db失败时恢复连接.

<dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-c3p0</artifactId>
            <version>5.2.9.Final</version>
</dependency>

我正在使用hibernate版本:

<dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>5.2.9.Final</version>
</dependency>

postgresql驱动程序是:

<dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>42.1.4</version>
</dependency>

c3p0配置是:

 properties.put("hibernate.c3p0.preferredTestQuery","SELECT 1");
    properties.put("hibernate.c3p0.testConnectionOnCheckout","true");
    properties.put("hibernate.c3p0.acquireRetryAttempts","1");
    properties.put("hibernate.c3p0.acquireIncrement","1");
    properties.put("hibernate.c3p0.idleConnectionTestPeriod","60");

但我一直收到这个错误:

18:25:32.910 [localhost-startStop-1] DEBUG c.m.v2.c3p0.impl.NewPooledConnection - com.mchange.v2.c3p0.impl.NewPooledConnection@755e3afe handling a throwable.
java.sql.SQLFeatureNotSupportedException: Method org.postgresql.jdbc.PgConnection.createClob() is not yet implemented.
    at org.postgresql.Driver.notImplemented(Driver.java:669) ~[postgresql-42.1.4.jar:42.1.4]
    at org.postgresql.jdbc.PgConnection.createClob(PgConnection.java:1246) ~[postgresql-42.1.4.jar:42.1.4]
    at com.mchange.v2.c3p0.impl.NewProxyConnection.createClob(NewProxyConnection.java:1408) ~[c3p0-0.9.5.2.jar:0.9.5.2]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_121]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_121]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_121]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_121]
    at org.hibernate.engine.jdbc.env.internal.LobCreatorBuilderImpl.useContextualLobCreation(LobCreatorBuilderImpl.java:113) [hibernate-core-5.2.9.Final.jar:5.2.9.Final]
    at org.hibernate.engine.jdbc.env.internal.LobCreatorBuilderImpl.makeLobCreatorBuilder(LobCreatorBuilderImpl.java:54) [hibernate-core-5.2.9.Final.jar:5.2.9.Final]
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentImpl.<init>(JdbcEnvironmentImpl.java:271) [hibernate-core-5.2.9.Final.jar:5.2.9.Final]
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:114) [hibernate-core-5.2.9.Final.jar:5.2.9.Final]
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35) …