org.postgresql.util.PSQLException：协议错误。会话设置失败

我知道这些类型的问题已经存在，但是提供的解决方案对我不起作用。在我的应用程序中，没有版本不匹配的黑白驱动程序和PostgreSQL服务器。我还没有找到其他解决方案。

I know these types of questions are already there but provided solution is not working for me.In my application there is no version mismatch b/w driver and PostgreSQL server. I have not found any other solution for this.

我正在使用PostgreSQL服务器9.4和postgresql-9.4-1201.jdbc4.jar。

I am using PostgreSQL server 9.4 and postgresql-9.4-1201.jdbc4.jar.

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="org.postgresql.Driver"></property>
    <property name="username" value="postgres"></property>
    <property name="password" value="root"></property>
    <property name="url" value="jdbc:postgresql://localhost:5432/myapp"></property>
</bean>

pg_hba.conf如下：

pg_hba.conf is as follows:

host    all             all             127.0.0.1/32            md5
host    all             all             ::1/128                 md5

postgresql.conf如下

postgresql.conf is as follows

listen_addresses = '*'
port = 5432         
max_connections = 100

我还检查了netstat o / p。

I have also check the netstat o/p .

TCP    [::]:5432              [::]:0                 LISTENING
TCP    127.0.0.1:5432         0.0.0.0:0              LISTENING

谢谢