JSP and Servlets Tutorial: Beginner’s Guide

By / March 14, 2023

In this article, we will explore the JSP and Servlets tutorial for beginners, and show you how to troubleshoot and resolve some of the issues that you may have with the technology.

  • JSP and Servlets are server-side web technologies that allow users to create dynamic websites.
  • This JSP tutorial will teach you how to use JSPs, create JSP pages, and compile them.
  • Oracle and Tomcat are the default tools for JSPs, so we’ll also show you how to use them.

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    Modify the Log4J configuration file

    1. Open the Log4j configuration file (log4j2.xml), which contains the log4j2 configuration.
    2. Locate the appenders section of the configuration file.
      Locate the appenders section of the configuration file.
    3. In the appenders section, locate the SimpleLayout (this is the default appender).
    4. Locate the PatternLayout appender, and delete it.
    5. Save the changes, and start the application.

    Use a different Logback configuration file

    1. Locate the Logback.xml file in the resources folder.
    2. Open the file in a text editor and replace all instances of “xml” with “yaml” and save the changes.
    3. Restart your web server.
      Restart your web server.

    Use a different Logback appender

    1. Logback is the default logging framework for Spring MVC. The errors that Users sometimes face with Logback include the following:
    2. The error: WARN [org.apache.logging.log4j.core.appender.JDBCAppender] (http-127.0.0.1-8080-2) Could not instantiate JDBC 3.0 driver class com.mysql.jdbc.Driver
    3. The error: WARN [org.apache.logging.log4j.core.appender.JDBCAppender] (http-127.0.0.1-8080-2) Could not instantiate JDBC 3.0 driver class com.microsoft.sqlserver.jdbc.SQLServerDriver
    4. The error: WARN [org.apache.logging.log4j.core.appender.JDBCAppender] (http-127.0.0.1-8080-2) Could not instantiate JDBC 3.0 driver class com.oracle.jdbc.OracleDriver
    5. The error: WARN [org.apache.logging.log4j.core.appender.JDBCAppender] (http-127.0.0.1-8080-2) Could not instantiate JDBC 3.0 driver class com.ibm.db2.jcc.DB2Driver
    6. The error: WARN [org.apache.logging.log4j.core.appender.JDBCAppender] (http-127.0.0.1-8080-2) Could not instantiate JDBC 3.0 driver class com.ibm.db2.jcc.DB2Driver
    7. The error: WARN [org.apache.logging.log4j.core.appender.JDBCAppender] (http-127.0.0.1-8080-2) Could not instantiate JDBC 3.0 driver class com.microsoft.sqlserver.jdbc.SQLServerDriver
    8. The error: WARN [org.apache.logging.log4j.core.appender.JDBCAppender] (http-127.0.0.1-8080-2) Could not instantiate JDBC 3.0 driver class com.microsoft.sqlserver.jdbc.SQLServerDriver
    9. The error: WARN [org.apache.logging.log4j.core.appender.JDBCAppender] (http-127.0.0.1-8080-2) Could not instantiate JDBC 3.0 driver class com.oracle.jdbc.OracleDriver
    10. The error: WARN [org.apache.logging.log4j.core.appender.JDBCAppender] (http-127.0.0.
      The error: WARN [org.apache.logging.log4j.core.appender.JDBCAppender] (http-127.0.0.

    Increase the JVM’s logging level

    1. Follow the steps from method 2 in this section.
    2. Open the /bin/sh file, locate the LOG_LEVEL variable, and change it from TRACE to DEBUG.
      Open the /bin/sh file, locate the LOG_LEVEL variable, and change it from TRACE to DEBUG.

    Upgrade to Java 8

    1. Install Tomcat 7
      Check JSP and Servlets Tutorial Error
    2. Watch YouTube Videos
      Watch YouTube Videos
    3. Install Eclipse
    4. Install Eclipse with Tomcat
    5. Install Tomcat on Windows 7 or 8

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    • Use WebLogic logging

    1. Navigate to your WebLogic server and start it.
    2. Now, navigate to the WebLogic console.
      Now, navigate to the WebLogic console.
    3. Select the Server > Logging option.
    4. Find and select WebLogic’s Server Logging option.
    5. Next, select the Enable logging option.
    6. Now, click the Save button.
      Now, click the Save button.

    Disable the attribute filter

    1. Start Eclipse and go to Window > Preferences.
    2. Go to Java > Code Style.
      Go to Java > Code Style.
    3. Expand the Annotations section, then search for the annotation javax.servlet.http.HttpSession attribute filter.
    4. Find the setting Enable attribute filter and uncheck it.

    Change the default log level

    1. Navigate to the log4j2.properties file located in the /WEB-INF folder.
    2. Locate the logging level property. It’s value should be DEBUG.
      Locate the logging level property. It's value should be DEBUG.
    3. Change it to a level lower than DEBUG, for example WARN or ERROR.
    4. Restart Tomcat.
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    Clear the log4j2 cache

    1. Open a terminal window -> type †̃sudo rm -r /var/cache/log4j2-2.11.0/ †̃ into the terminal.
    2. Open Eclipse -> go to Help -> Install New Software.
    3. Click on Add button -> select †̃ Trautwein ‘ -> click on Next.
      Click on Add button -> select †̃ Trautwein ' -> click on Next.
    4. Click Finish -> restart Eclipse.
    5. Save your project -> try compiling.
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