to be a physics scientist is easier than doing a hello world example in STS

[AladdinHoms]

For 2 weeks I've been trying to make a very veeeeeeeeeeeerrrrrrrrrrrryyyyyyyy basic hello world example in STS MVC.
okay,
I use this
File - New - Dynamic we project
and then try to run it,
I get this:

Dec 07, 2011 6:13:47 PM com.springsource.tcserver.security.PropertyDecoder <init>
INFO: tc Runtime property decoder using memory-based key
Dec 07, 2011 6:13:47 PM com.springsource.tcserver.security.PropertyDecoder <init>
INFO: tcServer Runtime property decoder has been initialized in 187 ms
Dec 07, 2011 6:13:48 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Dec 07, 2011 6:13:48 PM com.springsource.tcserver.serviceability.rmi.JmxSocketListener init
INFO: Started up JMX registry on 127.0.0.1:6969 in 68 ms
Dec 07, 2011 6:13:48 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 786 ms
Dec 07, 2011 6:13:48 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Dec 07, 2011 6:13:48 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: VMware vFabric tc Runtime 2.6.1.RELEASE/7.0.20.B.RELEASE
Dec 07, 2011 6:13:48 PM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor EchoSpringMVC.xml from D:\springsource\vfabric-tc-server-developer-2.6.1.RELEASE\spring-insight-instance\conf\Catalina\localhost
Dec 07, 2011 6:13:48 PM org.apache.catalina.startup.SetContextPropertiesRule begin
WARNING: [SetContextPropertiesRule]{Context} Setting property 'source' to 'org.eclipse.jst.jee.server:EchoSpringMVC' did not find a matching property.
Dec 07, 2011 6:13:48 PM com.springsource.insight.collection.tcserver.ltw.TomcatWeavingInsightClassLoader start
INFO: Context [localhost|EchoSpringMVC] will not be woven
Dec 07, 2011 6:13:49 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
java.lang.NoClassDefFoundError: org/apache/log4j/Level
	at org.slf4j.LoggerFactory.getSingleton(LoggerFactory.java:230)
	at org.slf4j.LoggerFactory.bind(LoggerFactory.java:121)
	at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:112)
	at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:275)
	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:248)
	at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:155)
	at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:131)
	at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:272)
	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:191)
	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4723)
	at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5226)
	at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5221)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Level
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1523)
	... 18 more

Dec 07, 2011 6:13:49 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Error listenerStart
Dec 07, 2011 6:13:49 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Context [/EchoSpringMVC] startup failed due to previous errors
Dec 07, 2011 6:13:49 PM org.apache.catalina.core.ApplicationContext log
INFO: Closing Spring root WebApplicationContext
Dec 07, 2011 6:13:49 PM org.apache.catalina.core.StandardContext listenerStop
SEVERE: Exception sending context destroyed event to listener instance of class org.springframework.web.context.ContextLoaderListener
java.lang.ExceptionInInitializerError
	at org.springframework.web.context.ContextLoaderListener.contextDestroyed(ContextLoaderListener.java:80)
	at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:4763)
	at org.apache.catalina.core.StandardContext$4.run(StandardContext.java:5473)
	at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.IllegalStateException: org.slf4j.LoggerFactory could not be successfully initialized. See also http://www.slf4j.org/codes.html#unsuccessfulInit
	at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:282)
	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:248)
	at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:155)
	at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:131)
	at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:272)
	at org.springframework.web.context.ContextCleanupListener.<clinit>(ContextCleanupListener.java:43)
	... 4 more

Dec 07, 2011 6:13:49 PM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor insight.xml from D:\springsource\vfabric-tc-server-developer-2.6.1.RELEASE\spring-insight-instance\conf\Catalina\localhost
Dec 07, 2011 6:13:49 PM com.springsource.insight.collection.tcserver.ltw.TomcatWeavingInsightClassLoader start
INFO: Context [localhost|insight] will not be woven
Dec 07, 2011 6:13:49 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring root WebApplicationContext
Dec 07, 2011 6:13:58 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring FrameworkServlet 'Spring MVC Dispatcher Servlet'
Dec 07, 2011 6:14:00 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory manager
Dec 07, 2011 6:14:00 PM com.springsource.insight.collection.tcserver.ltw.TomcatWeavingInsightClassLoader start
INFO: Context [localhost|manager] will not be woven
Dec 07, 2011 6:14:00 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory ROOT
Dec 07, 2011 6:14:00 PM com.springsource.insight.collection.tcserver.ltw.TomcatWeavingInsightClassLoader start
INFO: Context [localhost|ROOT] will not be woven
Dec 07, 2011 6:14:01 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Dec 07, 2011 6:14:01 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 12564 ms

why do I get these errors while I havn't added any thing to the project?
it is the very basic thing and I can't pass it!
please somebody help

[egervari]

This is more of a java-related problem. It has nothing to do with spring, or spring mvc. You do not have the log4j library in your classpath.

Are you using maven or gradle? You should use some kind of a build system where you declare which libraries you are using, such as spring and spring mvc, and it should include your log4j dependency for you. If not, it's pretty easy to add log4j as a dependency.

If you're not using maven, you'll have to download log4j, and then add the .jar file to your libraries.

I use IntelliJ IDEA and not STS... I think you might have an easier time with that too.

If you're new to Spring or even Java, I don't think this stuff is a good place to start. In fact, you might have a better chance of being productive by using Ruby and Rails or something like that.

In any case, don't expect your knowledge of being a physics scientist to instantly translate into being an amazing java developer. It's an entirely different profession that requires a time commitment. I know physics people are actually expected to be decent programmers, but I never understood why they don't just pair up physics people with a software developer and have them pair program. Would be more efficient.

[rohan123]

add log4j jar into your classpath it will work.

[AladdinHoms]

thank you @egervari,
What previous knowledge should I have before I am ready to start learning Spring MVC?
I know JAVA and OOP basics very well. what else do I need?

[AladdinHoms]

add log4j jar into your classpath it will work.

I wish I know how to!

[egervari]

I would say learning about classpaths would be a good place to start This is knowledge you have to know before you start working with web containers and such things. The problem you're running into is not a spring mvc related problem at all - it is a classpath issue, and learning about your IDE.

If you learn about Maven, which is a build tool, you will learn how to add log4j to your classpath automatically without having to get into the nitty-gritty details of how to do it. This is how most people build projects with Spring. Spring has a lot of libraries it depends on, and unless you know what those are in advance, you should use a tool like Maven to go download them and include them into your classpath on your behalf.

I don't use eclipse/sts, but I'm sure there's a way to manually add jars to your classpath too. I use maven though because usually IDE's are smart enough to automatically include all of the necessary jars by simply reading in the maven pom.xml file.

Personally, I think IntelliJ IDEA is easier to use too. I don't like STS. Maybe give that IDE a try. You may find it easier. I think they focus a lot more on usability.

[xaydungnhapho]

I started for a programmer. And I'm happy when I meet people

[martinwo]

Hi,
I solved this issue in my new STS project by erasing log4j directory from maven local repository, and instructing STS to update dependencies again.
You can check where your log4j repository directory resides by going to "maven dependencies" in the package explorer tree, then expand that node, and look for the log4j jar file. At the right of the name there is the path.
The go there and erase the complete log4j directory.
Then go to the project top node at the package explorer --> right click --> maven --> update dependencies --> select your project --> uncheck offline --> ok
Then at the progress bar you should see log4j being retrieved from maven central repository (i guess is from central i do not remmember).
Then restart your tomcat or whatever server you have.

I also had issues with other dependencies and i did the same procedure. I think when i first downloaded dependencies from maven, my connection went down, and so some dependencies got corrupted (is that possible?)

These worked for me,
Hope it does for you!
Martin.