Can Someone help me to solve this issue in Siddhi Stream Processor?

Question

[2020-05-06_16-31-42_744] ERROR {com.zaxxer.hikari.pool.HikariPool} - HikariPool-32 - Exception during pool initialization. 
java.sql.SQLException: The server time zone value 'unknown' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the 'serverTimezone' configuration property) to use a more specifc time zone value if you want to utilize time zone support.
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:73)
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:76)
    at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:836)
    at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:456)
    at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246)
    at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:197)
    at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:121)
    at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:353)
    at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:201)
    at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:473)
    at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:562)
    at com.zaxxer.hikari.pool.HikariPool.(HikariPool.java:115)
    at com.zaxxer.hikari.HikariDataSource.(HikariDataSource.java:81)
    at io.siddhi.extension.store.rdbms.RDBMSEventTable.initializeDatasource(RDBMSEventTable.java:1362)
    at io.siddhi.extension.store.rdbms.RDBMSEventTable.connect(RDBMSEventTable.java:1092)
    at io.siddhi.core.table.record.AbstractQueryableRecordTable.connectAndLoadCache(AbstractQueryableRecordTable.java:206)
    at io.siddhi.core.table.Table.connectWithRetry(Table.java:406)
    at io.siddhi.core.SiddhiAppRuntimeImpl.startWithoutSources(SiddhiAppRuntimeImpl.java:455)
    at io.siddhi.core.SiddhiAppRuntimeImpl.start(SiddhiAppRuntimeImpl.java:424)
    at io.siddhi.distribution.editor.core.internal.DebugRuntime.start(DebugRuntime.java:93)
    at io.siddhi.distribution.editor.core.internal.DebugProcessorService.start(DebugProcessorService.java:42)
    at io.siddhi.distribution.editor.core.internal.EditorMicroservice.start(EditorMicroservice.java:761)
    at io.siddhi.distribution.editor.core.internal.EditorMicroservice.startWithVariables(EditorMicroservice.java:781)
    at sun.reflect.GeneratedMethodAccessor18.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.wso2.msf4j.internal.router.HttpMethodInfo.invokeResource(HttpMethodInfo.java:187)
    at org.wso2.msf4j.internal.router.HttpMethodInfo.invoke(HttpMethodInfo.java:143)
    at org.wso2.msf4j.internal.MSF4JHttpConnectorListener.dispatchMethod(MSF4JHttpConnectorListener.java:218)
    at org.wso2.msf4j.internal.MSF4JHttpConnectorListener.lambda$onMessage$58(MSF4JHttpConnectorListener.java:129)


    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)
Caused by: com.mysql.cj.exceptions.InvalidConnectionAttributeException: The server time zone value 'unknown' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the 'serverTimezone' configuration property) to use a more specifc time zone value if you want to utilize time zone support.
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61)
    at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:85)
    at com.mysql.cj.util.TimeUtil.getCanonicalTimezone(TimeUtil.java:132)
    at com.mysql.cj.protocol.a.NativeProtocol.configureTimezone(NativeProtocol.java:2120)
    at com.mysql.cj.protocol.a.NativeProtocol.initServerSession(NativeProtocol.java:2143)
    at com.mysql.cj.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:1310)
    at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:967)
    at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:826)
    ... 30 more



[2020-05-06_16-31-42_749] ERROR {io.siddhi.core.table.Table} - Error on 'Assignment_02_01'. Failed to initialize pool: The server time zone value 'unknown' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the 'serverTimezone' configuration property) to use a more specifc time zone value if you want to utilize time zone support. . Error while connecting to Table 'table1'. (Encoded) 
com.zaxxer.hikari.pool.HikariPool$PoolInitializationException: Failed to initialize pool: The server time zone value 'unknown' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the 'serverTimezone' configuration property) to use a more specifc time zone value if you want to utilize time zone support.
    at com.zaxxer.hikari.pool.HikariPool.throwPoolInitializationException(HikariPool.java:597)
    at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:576)
    at com.zaxxer.hikari.pool.HikariPool.(HikariPool.java:115)
    at com.zaxxer.hikari.HikariDataSource.(HikariDataSource.java:81)
    at io.siddhi.extension.store.rdbms.RDBMSEventTable.initializeDatasource(RDBMSEventTable.java:1362)
    at io.siddhi.extension.store.rdbms.RDBMSEventTable.connect(RDBMSEventTable.java:1092)

Answer 1

Error Cause was

The server time zone value 'unknown' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver

In jdbcURL string

update it to

?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC

put above line to after your db name check below example

databaseName=yourDbNameThenput?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC