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IntelliJ Super Productivity in 45 Minutes

Dr Heinz M. Kabutz

Java Champions Conference, 23rd January 2023

In 2003, Heinz was asked to fix bugs and add features to a bowl of spaghetti code. It was a dismal task. He had heard of IntelliJ IDEA's supernatural analyzing powers. At the end of his 30 day trial, he purchased his first IntelliJ license. Often after his talks, instead of asking about the topic he spoke about, curious onlookers wanted to know how he had performed his IntelliJ magic. Here are your answers.

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An error has occurred.
Please contact us quoting the URL of the page you are attempting to view and the following message(s): 

    org.apache.jasper.JasperException: An exception occurred processing [WEB-INF/jsp/skin4/newsletter-slider.jsp] at line [7]

4: <%@ page import="eu.javaspecialists.tjsn.model.pojos.*" %>
5: 
6: <%
7:     SetupManager sm = SetupManager.getInstance(application);
8:     NewsletterManager nm = sm.getNewsletterManager();
9:     Newsletter[] newsletters = nm.getLatestNewsletters(6).toArray(new Newsletter[0]);
10: %>


Stacktrace:
	at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:567)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:456)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:330)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:281)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:710)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:128)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:513)
	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:411)
	at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:899)
	at org.apache.jsp.talks._23_002d01_002dJChampionsConf.index_jsp._jspService(index_jsp.java:174)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:64)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:710)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:428)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:330)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:281)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:710)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:128)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:165)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:77)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:492)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:113)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:83)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:782)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:72)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341)
	at org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:425)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:1272)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1801)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:946)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:480)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:57)
	at java.base/java.lang.Thread.run(Thread.java:1527)
Caused by: java.lang.IllegalArgumentException: duplicate UUID: c71778a1-36d9-45fd-a1d5-85c621ebb09a
	at eu.javaspecialists.tjsn.certificate.model.UUIDRegistry.add(UUIDRegistry.java:11)
	at eu.javaspecialists.tjsn.certificate.model.Student.(Student.java:15)
	at eu.javaspecialists.tjsn.model.CertificateManager.addTestData(CertificateManager.java:445)
	at eu.javaspecialists.tjsn.model.CertificateManager.setup(CertificateManager.java:83)
	at eu.javaspecialists.tjsn.model.CertificateManager.(CertificateManager.java:37)
	at eu.javaspecialists.tjsn.model.SetupManager.(SetupManager.java:18)
	at eu.javaspecialists.tjsn.model.SetupManager.getInstance(SetupManager.java:54)
	at org.apache.jsp.WEB_002dINF.jsp.skin4.newsletter_002dslider_jsp._jspService(newsletter_002dslider_jsp.java:131)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:64)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:710)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:428)
	... 34 more

      

    org.apache.jasper.JasperException: An exception occurred processing [WEB-INF/jsp/skin4/newsletter-slider.jsp] at line [7]

4: <%@ page import="eu.javaspecialists.tjsn.model.pojos.*" %>
5: 
6: <%
7:     SetupManager sm = SetupManager.getInstance(application);
8:     NewsletterManager nm = sm.getNewsletterManager();
9:     Newsletter[] newsletters = nm.getLatestNewsletters(6).toArray(new Newsletter[0]);
10: %>


Stacktrace:
	at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:567)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:456)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:330)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:281)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:710)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:128)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:513)
	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:411)
	at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:899)
	at org.apache.jsp.talks._23_002d01_002dJChampionsConf.index_jsp._jspService(index_jsp.java:174)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:64)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:710)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:428)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:330)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:281)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:710)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:128)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:165)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:77)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:492)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:113)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:83)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:782)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:72)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341)
	at org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:425)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:1272)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1801)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:946)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:480)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:57)
	at java.base/java.lang.Thread.run(Thread.java:1527)
Caused by: java.lang.IllegalArgumentException: duplicate UUID: c71778a1-36d9-45fd-a1d5-85c621ebb09a
	at eu.javaspecialists.tjsn.certificate.model.UUIDRegistry.add(UUIDRegistry.java:11)
	at eu.javaspecialists.tjsn.certificate.model.Student.(Student.java:15)
	at eu.javaspecialists.tjsn.model.CertificateManager.addTestData(CertificateManager.java:445)
	at eu.javaspecialists.tjsn.model.CertificateManager.setup(CertificateManager.java:83)
	at eu.javaspecialists.tjsn.model.CertificateManager.(CertificateManager.java:37)
	at eu.javaspecialists.tjsn.model.SetupManager.(SetupManager.java:18)
	at eu.javaspecialists.tjsn.model.SetupManager.getInstance(SetupManager.java:54)
	at org.apache.jsp.WEB_002dINF.jsp.skin4.newsletter_002dslider_jsp._jspService(newsletter_002dslider_jsp.java:131)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:64)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:710)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:428)
	... 34 more

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