When I imported my project in Eclipse Oxygen, it gave the below error.
"The project was not built due to "Could not delete '/Help/build/classes/exportFile'.". Fix the problem, then try refreshing this project and building it since it may be inconsistent"
Googled and got that to delete the contents of the bin folder and clean the project. But there's no bin folder. Tried cleaning, still the same error. What else can be done
You found a solution yourself, but here are some more informations about this error.
First, you said, your search brought up answers where deleting the bin-directory manually solves this but you don't have this directory. Reason for that is that you configured your project to write classes to the classes-directory (bin is the default).
The "cannot delete" message appears mainly on Windows systems if there is another process keeping a lock on the directory or files within. The classic reason for that is that you currently run the application or that you have an Explorer window open that shows the content of this directory. Closing the application/Explorer window normally solves the problem. Sometimes the lock keeps staying. A way to find the culprit is using Sysinternal's ProcessExplorer. It allows you to search for it by using Find->Find handle or DLL. The result can be clicked on and you can even forcefully close that entry, releasing the lock (some programs don't like that but I never had any problems doing that).
But sometimes it's actually necessary to reboot the system if you can't get rid off the lock otherwise.
My question is that recently I have started a web project in IDEA, with some servlet filter. At first it was ok ,but today I've found my idea's hot deploy dosen't work again.
For example,when I changed servlet , I need to hit ctrl+shift+F9 to recompile and it will work automaticlly. Now it just run like I didn't change it, even restarted tomcat doesn't help.
Now the only way to update changes is to restart the IDEA whenever I alter java file, servlet, filter, listener, java bean,etc.
I have checked the output path, the class file did changed, the last modification date shows correctly,and I only had one output path.
I figure it is some thing to do with the project setting?
Here are some pictures of my project settings:
And also, whenever I creat a servlet or listener, it shows this weird thing in the Web windows below the Project explorer, like it was loading, sometimes it literally shows loading..., like this:
When I recompile the Module,it shows
Warning: Output path D:\IDEADevelop\LittleBBS\web intersects with a source root. Only files that were created by build will be cleaned.
On the Project tab, replace
D:\IDEADevelop\LittleBBS\web\WEB-INF\classes with
D:\IDEADevelop\LittleBBS\out.
On the Modules tab, click the option Inherit project compile output path.
On the other tabs, ensure that the output directories are consistent to D:\IDEADevelop\LittleBBS\out
I'm developing a web service, and whenever I try to debug on server this is what I get, even though if I run on server everything goes fine!!!
I've been stuck on this now for 2 days !!!
Thanks for the help guys.
UPDATE
clicking on change attached source shows:
The Eclipse debugger needs the source code of what's executing on the server. Typically, you can download the source online as a jar or zip, then save it somewhere on your machine. Then click "Change Attached Source" and point to the downloaded source jar or directory where the zip was extracted.
~NCM
Finally after 3 days stuck on this, all I had to do is to Remove all break points by going to
breakpoints view -> Right click on any breakpoint -> remove all
I have a web site project in Eclipse and I needed to copy it and rename it for a new client. So I had my tortisesvn export the site to a new directory and changed the project name in the .project file and imported it into the same workspace in Eclipse. It seems to be running ok but now when I get errors in the console window the links that should take me to the line of the error take me to the file in the original project not the new one. Anybody know what I can do to fix this?
EDIT: In case anyone asks. I'm sure it's using the correct file when running the site and the error number is on the correct line. I put an intentional divide by 0 error in my code to test this and I get the expected error in the console window on the line that the error is on but it still sends me to the same file name but in the other project.
I found this one with some more searching: Eclipse opens wrong source file on exception
It seems if I remove the other project from the server in tomcat it goes to the correct spot. What a pain.
I am working on my project of quiet sometime now I am using tomcat and eclipse both working correctly till now..
I deployed the war on 22-1-2012 ( with some print messages) it was working correctly then next day I made some changes removed some messages and redeployed the file...In my webapps folder it is showing the latest time for 'last modified' of my war file.. what wrong i am doing tell me..
P.S any changes to JSP pages of same project are reflected but servlet class is unchanged
This is what log file shows
_SEVERE: A web application appears to have started a TimerThread named [MySQL Statement Cancellation Timer] via the java.util.Timer API but has failed to stop it. To prevent a memory leak, the timer (and hence the associated thread) has been forcibly cancelled. _
Well this is the summary of my problem i hope i can explain you now the problem
i again performed the following steps
Deleted my webapp directory from webapps
Tried to access servlet (it shows 'Resource not available')
Make some changes in print statement to debug
Redeployed WAR from eclipse
Again when access that servlet it is not the latest version it is showing same old messages.
Now tell me if there is solution....
Thanks in advance
After trying so many thing i just observed when i deploy the WAR file non-JSP servlet class files were not included in WAR when I manually add these class files in WAR all the changes are updated.. So now can u tell me how to auto deploy these in WAR..whats the problem?
The JSP files are not updating because they were precompiled, and even though they may pull information from files that have changed, each JSP file that may be affected needs to have a minor change made to it, like add a space and then remove a space, and then save it.
Then build your WAR, and then the updates should show. I went through this same problem tonight and none of the other answers helped. The key is, to check the file dates in the Tomcat directory of where you deployed the WAR. I noticed that even though I was deploying an entirely new cleaned WAR, and deleting all folders, there were still older cached files in there, probably because Eclipse keeps them to save compile time, thinking they don't have any changes.
Hope this helps
Go to Servers View in Eclipse:
Double click on your server. In my case, it’s Tomcat.
A Tomcat Web Module should pop up. Click on Modules tab at the very bottom (see Pic1)
Select your project. Click “Remove” button.
Pic 1:
Now you should see a star next to the Tomcat Tab. That means you need to save your changes. So do a Control+S.
Pic 2:
Right-click on your project in Project Explorer. Go to Maven -> Update Project…
Pic 3:
Now this is the important part, make sure you have “Force Update of Snapshots/Releases” checked. Having that part checked is critical. Then click Ok.
Pic 4:
Now look at your Server View. It should look like this, with a “Restart” warning telling you that it’s out of sync.
Pic 5:
Right-click on it and choose Restart
Pic 6:
Let the server restart. Now if you go back to the Server View, you should see that it’s synchronized. That’s what you want. Like this:
Pic 7:
Now you should be able to right-click on your project and choose “Run As” -> Run on Server and you should see your changes.
Pic 8:
If things still didn’t update, go back and look at your Server View and make sure it doesn’t say the restart thing like in Pic 5 above. If it does, please restart your server again like in Pic 6. Then click refresh on the browser.
Go to browser settings and clear the cache.
Check the log files for Tomcat, I bet there is a startup problem with your web app and it's not getting deployed.
The reality is that Tomcat cannot be running code it doesn't have a copy of. Especially if you have restarted it. It sounds like there is a separate "copy" of your web app that is actually in use. Either made inadvertently by you (hey lets face it, we've all done this) OR made by Tomcat in a location you weren't aware of.
Pick a unique file that exists within your web app. Maybe an icon name, or a configuration file name. Search the entire hard drive for it to locate exploded copies of the WAR file. This will help find it in a temp directory or working folder. Make sure to clean those up.
Also, make sure you are running the Tomcat that you think you are. Most developers with multiple Tomcat installations has also made the mistake of deploying to a different location. Look at the process list to see the arguments given to the JVM at launch time. Be sure to also check environment variable for things like CATALINA_HOME.
EDIT: Your update that JSP pages change, but classes do not make me think you have multiple JAR files on the class path that have the same file in it (one older version loaded first) OR you have changed a class name in the code base, but not updated references to it.
any changes to JSP pages of same project are reflected but servlet class is unchanged
It is not clear what you are saying.
If you are saying that the updated JSPs are in the expanded webapp directory, but the generated / compiled JSP classes have not changed (in the work directory), then try deleting the classes from the work directory. You may need to restart the web container too.
If you are saying that the non-JSP servlet classes have been updated (in the webapp) but you are not running them, then try restarting the web container.
If you are saying that the non-JSP servlet classes have not been updated in the webapp directory, then something went wrong in the webapp deployment. Shutdown the web container, delete the webapp directory (and the compiled JSPs for good measure) and restart the webapp.
After trying so many thing i just observed when i deploy the WAR file non-JSP servlet class files were not included in WAR when I manually add these class files in WAR all the changes are updated.. So now can u tell me how to auto deploy these in WAR..whats the problem?
So the problem is nothing to do with deployment. The problem is that you are not building the WAR file correctly in the first place.
I can't help with this because I don't use Eclipse to build my WAR files. (I use Maven so that the build process is scripted and reproducible ... and doesn't depend on me clicking the right buttons in the right order every time.)
is your tomcat server.xml pointing to the right Workspace?
to make sure, you go to tomcat installed directory -- find server.xml in the confi folder
for every war file, tomcat creates a similar named folder. Delete the folder, try to redeploy war again, hope it will reflect.
In web.xml file add one letter at the end and delete it and then by pressing enter save the file. After that run the program and it works with updated data.
go to catalina home\conf\context.xml
change <Context> to <Context reloadable="true">
Make sure you restart tomcat.
Boom.
You might have to still press F5 or Ctrl+F5 two or three times though.
TL;DR: Make sure your eclipse project is set to build automatically: Project > Build Automatically
I apologize for answering without having complete knowledge of what the WAR files are, but I assume the WAR files are the compiled .class files in the "build" folder.
I noticed that when I saved my Servlet "HelloWorld.java" in my case, that the compiled "HelloWorld.class" did not update at all. I could force the project to build by right clicking the java project and selecting "Build Project". After Building the project, the "HelloWorld.class" file was successfully updated, but the updated code still did not show on the server.
To get the results to show on the server, I had to click on my server (mine was called "Tomcat v9.0 Server at localhost [Started, Synchronized]") and then I clicked "Publish to Server". If you do not see your Servers, do: Window > Show View > Servers
I didn't even have to restart the server, after a few seconds (and refreshing google chrome), the website updated itself!
Of course manually building and publishing (and possibly restarting) the server is kind of too much for my lazy fingers, so I found how to fix it. You can just go to Project > Build Automatically. and then the website will update anytime you save a modified java file.
This solution worked for me because I was only missing the automatic building. but you could also have a problem where the server doesn't automatically publish.
I personally didn't have this problem so I'm just speculating, but there are some settings for publishing. In your "Servers" view, double click on your server name (in my case, double click on "Tomcat v9.0 Server at localhost [Started, Synchronized]"). A tab should open up showing your server settings. Expand the section titled "Publishing", and set your publishing settings as you desire. Right now mine is set to "Automatically publish when resources change".
Unfortunately I have no clue how to make the server automatically restart upon the saving of a modified .java file.