liujuntao opened a new issue #2860: Access Sharing-Proxy RC4.2.0 with navicat return null exception for lack of scheam URL: https://github.com/apache/incubator-shardingsphere/issues/2860 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)
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