tuohai666 edited a comment on issue #2860: Access Sharing-Proxy 4.0.0RC2 with navicat return null point exception for lack of scheam URL: https://github.com/apache/incubator-shardingsphere/issues/2860#issuecomment-521140566 > I used the offical example of proxy, when i use navicat to access the proxy, it thrown the exception below, so the test cannot continue. since i don't very familer with the code ,so i just trace to that, datasource name of BackenConnection is null lead to this issue。 > Below is the excepiton， and the configure also be attached. > And the proxy is comminucate with QUERY_COM ,and the query sql is "SELECT SCHEMA_NAME, DEFAULT_CHARACTER_SET_NAME, DEFAULT_COLLATION_NAME FROM information_schema.SCHEMATA" > > ava.lang.NullPointerException: null > at org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.datasource.JDBCBackendDataSource.createConnection(JDBCBackendDataSource.java:150) > at org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.datasource.JDBCBackendDataSource.getConnections(JDBCBackendDataSource.java:123) > at org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.connection.BackendConnection.getConnectionFromUnderlying(BackendConnection.java:189) > at org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.connection.BackendConnection.getConnectionsWithoutTransaction(BackendConnection.java:172) > at org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.connection.BackendConnection.getConnections(BackendConnection.java:141) > at org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.execute.callback.ProxyJDBCExecutePrepareCallback.getConnections(ProxyJDBCExecutePrepareCallback.java:56) > at org.apache.shardingsphere.core.execute.sql.prepare.SQLExecutePrepareTemplate.getSQLExecuteGroups(SQLExecutePrepareTemplate.java:89) > at org.apache.shardingsphere.core.execute.sql.prepare.SQLExecutePrepareTemplate.getSynchronizedExecuteUnitGroups(SQLExecutePrepareTemplate.java:67) > at org.apache.shardingsphere.core.execute.sql.prepare.SQLExecutePrepareTemplate.getExecuteUnitGroups(SQLExecutePrepareTemplate.java:59) > at org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.execute.JDBCExecuteEngine.execute(JDBCExecuteEngine.java:78) > at org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.JDBCDatabaseCommunicationEngine.execute(JDBCDatabaseCommunicationEngine.java:91) > at org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.JDBCDatabaseCommunicationEngine.execute(JDBCDatabaseCommunicationEngine.java:77) > at org.apache.shardingsphere.shardingproxy.backend.text.query.QueryBackendHandler.execute(QueryBackendHandler.java:54) > at org.apache.shardingsphere.shardingproxy.frontend.mysql.command.query.text.query.MySQLComQueryPacketExecutor.execute(MySQLComQueryPacketExecutor.java:72) > at org.apache.shardingsphere.shardingproxy.frontend.command.CommandExecutorTask.executeCommand(CommandExecutorTask.java:86) > at org.apache.shardingsphere.shardingproxy.frontend.command.CommandExecutorTask.run(CommandExecutorTask.java:66) > at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) > at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) > at java.lang.Thread.run(Thread.java:748) > > [config-files.zip](https://github.com/apache/incubator-shardingsphere/files/3495706/config-files.zip) Duplicate with #2673
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