Fuseki adapter - displays debug log exceptions

Hello

Today, I wanted to capture the error logs and wanted to see how the debugging log looks like.

Then, I placed a file log4j.properties with log level to debug. I knew a bizzare - the server output began and responded very well, but the newspaper kept piling up with the below error

25399 [OracleQueryProgressMonitor] DEBUG oracle.spatial.rdf.client.jena.OracleQueryProgressMonitor  - run: wake up after sleeping (ms) 3000
25400 [OracleQueryProgressMonitor] DEBUG oracle.spatial.rdf.client.jena.OracleQueryProgressMonitor  - getConnection: starts
25400 [OracleQueryProgressMonitor] DEBUG oracle.spatial.rdf.client.jena.OracleUtils  - getDataSource: starts
25401 [OracleQueryProgressMonitor] DEBUG oracle.spatial.rdf.client.jena.OracleUtils  - getDataSource: detect jboss by class org.jboss.jca.adapters.jdbc.WrapperDataSource
25401 [OracleQueryProgressMonitor] DEBUG oracle.spatial.rdf.client.jena.OracleUtils  - getDataSource: not in jboss
25402 [OracleQueryProgressMonitor] DEBUG oracle.spatial.rdf.client.jena.OracleUtils  - getDataSource: detect tomcat by class org.apache.catalina.ContainerServlet
25402 [OracleQueryProgressMonitor] DEBUG oracle.spatial.rdf.client.jena.OracleUtils  - getDataSource: not in tomcat
25403 [OracleQueryProgressMonitor] DEBUG oracle.spatial.rdf.client.jena.OracleUtils  - getDataSource: dsName: OracleSemDS
25403 [OracleQueryProgressMonitor] DEBUG oracle.spatial.rdf.client.jena.OracleQueryProgressMonitor  - run: get connection
javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file:  java.naming.factory.initial
        at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
        at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
        at javax.naming.InitialContext.getURLOrDefaultInitCtx(Unknown Source)
        at javax.naming.InitialContext.lookup(Unknown Source)
        at oracle.spatial.rdf.client.jena.OracleUtils.getDataSource(OracleUtils.java:867)
        at oracle.spatial.rdf.client.jena.OracleQueryProgressMonitor.getConnection(OracleQueryProgressMonitor.java:325)
        at oracle.spatial.rdf.client.jena.OracleQueryProgressMonitor.run(OracleQueryProgressMonitor.java:369)
        at java.lang.Thread.run(Unknown Source)

Seeing this, I created a data source named OracleSemDS and changed the config accordingly. This gave a new error-

25603 [OracleQueryProgressMonitor] DEBUG oracle.spatial.rdf.client.jena.OracleQueryProgressMonitor  - run: wake up after sleeping (ms) 3000
25605 [OracleQueryProgressMonitor] DEBUG oracle.spatial.rdf.client.jena.OracleQueryProgressMonitor  - run: exception
java.sql.SQLSyntaxErrorException: ORA-00942: table or view does not exist


        at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:445)
        at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:396)
        at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:879)
        at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:450)
        at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:192)
        at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531)
        at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:207)
        at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:884)
        at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1167)
        at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1289)
        at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3584)
        at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3628)
        at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:1493)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at oracle.ucp.jdbc.proxy.PreparedStatementProxyFactory.invoke(PreparedStatementProxyFactory.java:125)
        at com.sun.proxy.$Proxy1.executeQuery(Unknown Source)
        at oracle.spatial.rdf.client.jena.OracleQueryProgressMonitor.run(OracleQueryProgressMonitor.java:411)
        at java.lang.Thread.run(Unknown Source)

Can you let me know what is happening behind the scenes and if it is something that we should occupy ourselves with? What is OracleQueryProgressMonitor and there is an additional configuration that should be provided or additional packages that must be installed on the database instance?

Thank you

Akhilesh

Hi Anthony,.

What is expected. The reason is that we have a feature called management application which can cancel a SPARQL query via a servlet as end point:

http://:8080/joseki/querymgt?abortqid=123

There is a wire that will be periodically wake up and check if there is no job (killing a query). Trying to read from a table, but the

table was not created. The table will be automatically created when you ping this point Joseki servlet endpoint.

If you don't want to put in place the Joseki, then you can create the following table manually in the schema that you use.

create the table oracle_orardf_query_mgt_tab (NUMBER of QID, CREATION_TIME DATE) compress nologging;

CREATE INDEX oracle_orardf_query_mgt_tab_idx on oracle_orardf_query_mgt_tab (CREATION_TIME) nologging;

Thank you

Zhe Wu

Tags: Database

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