java.lang.NullPointerException

codeproject.com | 7 days ago
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    Upload image file into database using java servlet, jdbc and mysql

    blogspot.com | 7 months ago
    java.lang.AbstractMethodError: com.mysql.jdbc.PreparedStatement.setBlob(ILjava/io/InputStream;)V
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    how to solve this exception in Neo4j?

    Stack Overflow | 3 years ago | JackWang
    org.neo4j.graphdb.TransactionFailureException: Database is currently not available. No blocking components

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    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at UploadServlet.doPost()
    2. Unknown
      UploadServlet.doPost
      1. UploadServlet.doPost(UploadServlet.java)
      1 frame
    3. JavaServlet
      HttpServlet.service
      1. javax.servlet.http.HttpServlet.service(HttpServlet.java)
      2. javax.servlet.http.HttpServlet.service(HttpServlet.java)
      2 frames
    4. Glassfish Core
      CoyoteAdapter.service
      1. org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java)
      2. org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java)
      3. org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java)
      4. org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java)
      5. org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java)
      6. org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java)
      7. org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java)
      8. org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java)
      9. org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java)
      10. org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java)
      10 frames
    5. Grizzly HTTP
      JIoEndpoint$SocketProcessor.run
      1. org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java)
      2. org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java)
      3. org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java)
      3 frames
    6. Java RT
      Thread.run
      1. java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java)
      2. java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java)
      3. java.lang.Thread.run(Thread.java)
      3 frames