I have been struggling with a very weird issue that has suddenly popped up on the latest version of Eclipse Classic (4.2.2).
Everytime I try creating or refactoring a class or subclass in any of my projects (all Java) in my Eclipse workspace I get an error at the very top of my class that says
A class file was not written. The project may be inconsistent, if so try refreshing this project and building it
Again, this happens when I create new classes. And even when I rename current classes, then undo the renaming, its totally fine, but changing a single character in the name causes this error to happen for that specific class.
I have Auto Build on, and I tried multiple times to clean and refresh every project as well as restart Eclipse entirely.
I have literally no idea how to even start figuring out how to fix this. The solutions i've found through search didn't help, so i'm hoping I might find any clues here.
I had the same problem and here's how I solved it in the end:
It turned out that the disc space on the drive where workspace resides was full.
Silly mistake but worth checking.
In my case, this was caused by the fact that the build output directories were owned by a different user, and Eclipse could not write into them.
I had the same issues, the following worked for me:
Right click eclipse then running "as an Administrator"
Click Project > Clean.
Clean your workspace by starting eclipse from the command line with the -clean argument :
eclipse -clean
See also How to run eclipse in clean mode? and what happens if we do so?
I solved this problem by running Eclipse as root.
I had the same issue on Mac OS X. I had a maven project.
Try running the following command on Terminal. This looks like an access issue.
sudo mvn clean
Provide password for admin user.
Then open Eclipse and refresh your project.
We are using Eclipse here too and have to handle a workspace with more than 200 plug-ins. Every now and then people have similar problems with their workspace and inconsistencies reported in a weird way by Eclipse.
What people here usually do is (next step only in case previous step didn't help):
- trying to ContextMenu->Team->Clean/Refresh the whole workspace
- creating a new workspace and check out all necessary files from the repository
- reinstalling Eclipse to a new directory
From my experience after using the Eclipse IDE on a daily basis for many years, it doesn't make very much sense to waste too much time with these issues, unless they aren't solved by one of the steps above. It takes too much time to struggle with these things, while starting from scratch is done in an hour or less (and usually fixes the issue).
If your Eclipse still behaves strangely it might make sense to go through your installed plug-ins. Not all external plug-ins follow the Eclipse guidelines and can seriously harm the performance and operational consistency of your Eclipse installation (E.g. Sonar Plug-in, Toad Plug-in, ...)
In my case this kind of error caused due to disk space got full and it got resolved by just freeing disk space where eclipse have been installed.
That is c/d/e drivers.
I come up with the same error, and in my case, this is because the permission of the project/bin directory is not recursively 775
I fixed it by:
Remove the project/bin directory: sudo rm -rf project/bin
Switch to Eclipse, rebuild the project: Project->Clean...
Then no errors.
Try to launch Eclipse as Administrator.
In my case such error was caused by a question mark in a quoted method name (I use geb+spock combination for automated testing).
So this method name will throw an error "Do you want something?"()
And this will not "Do you want something"()
It may not be the best response but to fix it, I've just delete the error marker.
Had the same issue. but cleaning the project and restart eclipse didn't help and disk space was not the issue. Solved the issue by copy the code to notepad(just to not lose it) and then delete the class, recreate it and paste the code back in again.
I solved it changed the owner of the project files. I changed from root(old owner) to user my current(user that i use with eclipse).
Just changed and saved java file to recompile the class. Then error disappeared.
I was try run
Project->Clean...
And Rebuild. My problem was resolved
For linux (Debia) and working on Spring boot project (maven):
$ sudo mvn clean
Then open Eclipse and File -> Refresh.
I had same issue, it is something similar but this post didn't help in my case. I have many inner classes which is causing the compiler to create class names with all inner class names together that is creating class name more than 255 character file limit on NTFS! read it in some other blog. I thought it will be helpful to post here.
Ex : classA$InnerClassB$......InncerClassZ.class in target folder it won't generate the class if it exceeds this limit. Try renaming your inner class name shortened. In my case i have to add InnerclassZ as its exceeding its not generating class and Eclipse complaining.
A class file was not written. The project may be inconsistent, if so try refreshing....
I shortened InnerClassZ to IClassZ fixed the issue.
I had the same issue and it got fixed by running eclipse in administrator mode
Eclipse Shortcut-->Right click-->More-->Run as Administrator
I've been throught that error once when I used wsdl2java to extract java classes from a wsdl, it turns out that all classes were created in the same "class", causing end classes with long names (error - File name too long). When I organized and rename some classes the error disappeared.
I had this issue. I did the following, it resolved.
Open Eclipse in Administrator mode; Right click on eclipse.exe "Run as administrator"
Clean all projects.
#Denny's answer put me on the right track, though in my case it was the target directory. I deleted it for some reason and something automatically recreated with owner root. Changing the directory owner was not enough as it contained files that were also owned by root. So make sure to really remove the complete content of the directory and to change the owner.
In my case current user didn't have access to this project dir
Before giving a try to the above solutions. Just cleaned the project and it worked.
I've been using Eclipse a lot recently, and haven't had any problems with it. Last night, I was working on it perfectly fine. However, this morning, whenever I load it up, the program stops working half way the loading splash screen (before the actual workspace opens up). The information says "Loading Workbench" and just stays there forever. When I click on it multiple times, I get a message saying that Java(TM) Platform SE binary is not responding.
Google hasn't been a ton of help, and seems to just give a lot of responses about Minecraft. I'm slightly confused as to where I need to start looking, since nothing had changed since I successfully used it last. No updates to Java or Eclipse or anything else. Thanks for the help, and let me know if you need any more information!
I was actually able to fix it by just renaming my WorkSpace to WorkSpace1. Apparently it got corrupted somehow, and with the rename Eclipse was able to recreate a new one. Here's the link that helped me out:
http://spacetech.dk/eclipse-failed-java-was-started-but-returned-exit-code-805306369.html
Two things to check when you have problems with Eclipse:
First, always check the .log file, located in the .metadata directory (<workspace path>/.metadata/.log) of your workspace (not the Eclipse installation directory). Keep in mind that this is a hidden file under Linux or Mac OS. It usually contains the exception that is causing the crash. I usually delete any existing .log file before firing up Eclipse, just to make sure I am looking at the relevant log entries (the file will be recreated at startup).
If #1 does not help, you can try deleting the .metadata directory altogether. It will be recreated on startup (this is basically what you did by changing the workspace). In my experience with Eclipse, I noticed that some files can get corrupted inside .metadata, making Eclipse act weirdly. Keep in mind that this directory contains customizations you made in Eclipse and its plugins for the workspace and you might need to make them again.
Hope this helps.
Eclipse tends to be weird sometimes. If you move stuff around outside of the directories it was initially installed in, it usually won't load. I don't know if that's what you did, but your best bet is to back up your workspace, and reinstall eclipse. I'm sure that will do the trick.
Try a reinstall if possible or else, check the eclipse error log, which would be present at'/.metadata/.plugins/org.eclipse.ui.workbench/log'.
This will help you knowing the problem.
I am experiencing a problem where Rational Application Developer 8 consistently hangs indefinitely on startup. I've only been able to find a partial solution: I can get RAD to start up if I delete the <n>.tree file in the workspace's .metadata.plugins\org.eclipse.core.resources.root directory. Once started however, all projects must be re-imported.
What I can't seem to solve is the underlying issue -- the issue recurs after every shutdown of RAD, and I'm having to delete the .tree file and re-import the projects each time I start the app. Shutting down RAD normally does not prevent the problem from recurring; neither does removing all projects and cycling RAD with no projects (problems start again immediately the first time RAD is shut down with projects still imported). I've even created a new workspace from scratch, but it didn't help either.
I'm at a loss. If anyone has experienced this, any insight would be greatly appreciated.
I am currently experiencing the same problem with an older version of RAD and haven't found a working solution yet so far, but you might get some pointers from here:
How do I prevent Eclipse from hanging on startup?
At any rate, you can check the ./metadata/.log file in your workspace for useful information about where exactly it hangs.
There are many background process starts when Eclipse or RAD starts. You can disable the background process which is not required. These can be found under Window->Preferences->General->Startup and Shutdown.
Delete Temp files under /tmp folder and restart RAD...
Worked for me...
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How can you make the experience with Eclipse faster?
For instance: I disable all the plugins I don't need (Mylyn, Subclipse, …).
Instead of using a plugin for Mercurial, I configure TortoiseHG as an external tool.
The three most influential factors for Eclipse speed are:
Using the latest version of Eclipse (2020-06 as on 26 June 2020)
Note that David Balažic's comment (July 2014) contradicts that criteria which was working six years ago:
The "same" workspace in Indigo (3.7.2) SR2 loads in 4 seconds, in Kepler SR2 (4.3.2) in 7 seconds and in Luna (4.4.0) in 10 seconds. All are Java EE bundles. Newer versions have more bundled plugins, but still the trend is obvious. (by "same" workspace I mean: same (additionally installed) plugins used, same projects checked out from version control).
Launching it with the latest JDK (Java 14 at the time of writing, which does not prevent you to compile in your Eclipse project with any other JDK you want: 1.4.2, 1.5, 1.6 older...)
-vm jdk1.6.0_10\jre\bin\client\jvm.dll
Configuring the eclipse.ini (see this question for a complete eclipse.ini)
-Xms512m
-Xmx4096m
[...]
The Xmx argument is the amount of memory Eclipse will get (in simple terms). With -Xmx4g, it gets 4 GB of RAM, etc.
Note:
Referring to the jvm.dll has advantages:
Splash screen coming up sooner.
Eclipse.exe in the process list instead of java.exe.
Firewalls: Eclipse wants access to the Internet instead of Java.
Window management branding issues, especially on Windows and Mac.
Dec. 2020, Udo conforms in the comments
From version 4.8 (Photon) an up there was a steady speed gain after each version.
The main platform was optimized every release to load faster, enable more features for the dark theme and to add more features for newer Java versions for the Java development tools.
Especially with-in the last 3 versions the startup time was increased a lot. There should be a significant increase in start-up time with the newest version of Eclipse 2020-12.
In my experience it started a lot faster with each new version.
But: There are still plug-ins which do not follow the new way of using the Eclipse API and are therefore still slow to start.
Since the change to Java 11 as the minimum runtime version starting from Eclipse version 2020-09 at least the core system uses the newer features of the JVM. It is up to the providers of the other plug-ins to upgrade to newer APIs and to use the full power of modern CPUs (e.g. concurrent programming model).
See also
Giving Eclipse the right number of threads and the right amount of memory: Problem: Eclipse and the Eclipse indexer take up all my resources / CPU%
Add -Xverify:none to your eclipse.ini file.
It will cut down your Eclipse startup time considerably (50% in my case if not more). This will tell the VM not to validate all the .class files it is loading.
Consider this: Never Disable Bytecode Verification in a Production System
(as mentioned in the comments)
Go to Windows -> Preferences -> Validation and uncheck any validators you don't want or need.
For Eclipse 3.7, you use Windows -> Preferences -> General -> Startup and Shutdown.
Make sure that you're using the Sun JVM to run Eclipse.
On Linux, particularly Ubuntu, Eclipse is installed by default to use the open source GCJ, which has drastically poorer performance. Use update-alternatives --config java to switch to the Sun JVM to greatly improve UI snappiness in Eclipse.
Close any open projects which are not in current use.
Try to switch off the auto publish mode during development.
Thanks for the hints.
These options (mentioned above) helped me a lot:
Windows:
Increasing memory & regarding to my updated Java version in eclipse.ini:
-Dosgi.requiredJavaVersion=1.6
-Xms512m
-Xmx512m
-XX:PermSize=512m
-XX:MaxPermSize=512M
-Xverify:none
Additionally, since we are optimizing for speed, setting -Xms to the same value as -Xmx makes the JVM start with the maximum amount of memory it is allowed to use.
Linux / Ubuntu:
Using
update-alternatives --config java
Another performance boost can be gained by disabling label decorations
(Windows -> Preferences; General -> Appearance -> Label Decorations)
and by disabling unused capabilities on startup
(Windows -> Preferences; General -> Startup and Shutdown).
You may also get additional performance by choosing a different garbage collection strategy depending on your JVM.
If you're fed up with restart cycles you could use JavaRebel from ZeroTurnaround. That will shorten your time spent on server/client restarts.
While not directly related to Eclipse:
If you're running Windows 7 (and presumably Windows Vista), be sure to disable the file indexing of your workspace folder if your stuff is is in the default place - your home folder. Windows by default indexes everything in you home folder, and it's normally just a waste for your workspace. (Right click the workspace folder in explorer , Properties -> Advanced.)
Disable virus scanners, or at least configure any virus scanner to not scan JAR files on read access.
Eclipse loads plug-ins lazily, and most common plug-ins,
like Subclipse, don't do anything if you don't use them.
They don't slow Eclipse down at all during run time, and it
won't help you to disable them. In fact, Mylyn was shown to
reduce Eclipse's memory footprint when used correctly.
I run Eclipse with tons of plug-ins without any performance
penalty at all.
Try disabling compiler settings that you perhaps don't
need (e.g. the sub-options under "parameter is never read).
Which version of Eclipse are you using? Older versions
were known to be slow if you upgraded them over and over
again, because they got their plug-ins folder inflated
with duplicate plug-ins (with different versions). This
is not a problem in version 3.4.
Use working-sets. They work better than closing projects,
particularly if you need to switch between sets of
projects all the time.
It's not only the memory that you need to increase with the -Xmx
switch, it's also the perm gen size. I think that
problem was solved in Eclipse 3.4.
There is another thing that really speeds up Eclipse on both Windows and especially Linux - putting the JVM in RAM disk.
For Windows you can use the commercial RAM disk driver from Qsoft.
For Linux use any of the methods described in numerous articles on the Internet. It is important to give additional space to the RAM disk that is 10% bigger than the size of the JVM.
Check it out. It really makes a difference.
I give it a ton of memory (add a -Xmx switch to the command that starts it) and try to avoid quitting and restarting it- I find the worst delays are on startup, so giving it lots of RAM lets me keep going longer before it crashes out.
Along with the latest software (latest Eclipse and Java) and more RAM, you may need to
Remove the unwanted plugins (not all need Mylyn and J2EE version of Eclipse)
unwanted validators
disable spell check
close unused tabs in Java editor (yes it helps reducing Eclipse burden)
close unused projects
disable unwanted label declaration (SVN/CVS)
disable auto building
reference:making-eclipse-ide-faster
I implemented a plug-in to configure which features to be loaded in runtime to improve the performance and reduce the conflict among different plug-ins.
You may have installed many features into your Eclipse, such as Android development tools, C/C++ development tools, PHP, SVN, Git and ClearCase plug-ins. Hence Eclipse is heavy and costs a lot of memory, and some of them are not often used.
So you could use my tool to create different runtime policies, such as one that has Android, Git and base Eclipse, another one contains C/C++, SVN and base Eclipse. Next time Eclipse would only load the specified features if you're using the policy that only has Android and Git.
You are welcome to try it and give me the feedback. :)
The name of that tool is Equinox Advanced Configurator.
One more trick is to disable automatic builds.
I also tuned vmargs and stuff. But what really sped up Eclipse on Windows is the "proper" configuration of the anti-virus software. You have to disable the on-demand scanning of packed files. jar files, and many files related to java are packed with PKZIP algorithm to spare space. Because Eclipse uses tons of java files, an anti-virus attempts to individually unpack and scan every one of them. So for Windows platform: turn off the on-demand scanning of packed files, otherwise Eclipse will be unusably slow. Please keep in mind, that disabling this unfortunately makes your system weaker against attacks, most of the malware use packers.
I experienced a considerable improvement in performance when limiting the number of open tabs (in the past I frequently had 30+ tabs open). You can let Eclipse handle this for you automatically:
Window -> Preferences -> Editors -> close editors automatically
8 open tabs is the amount before the >> sign appears, so I tend to leave it at 8.
When opening more tabs, the ones the least recently accessed will be closed.
->When all editors are dirty or pinned
If it has unsaved modifications you can prompt to save & reuse (tab will be closed, a new one will be opened in its place). Or you can open a new editor end thus increase the amount of open tabs (the unobtrusive choice).
If you want to ensure some tabs never get closed autmatically, you can pin them. This by clicking on the pin icon (the rightmost icon in the toolbar, with "pin editor" as tooltiptext).
Best practices in this thread are implemented in the free Optimizer For Eclipse, from ZeroTurnaround.
What does it help with?
Insufficient memory allocation
Class verification overhead
Excessive indexes and history
Obsolete or slow JDK
Eclipse being out of date
Lengthy build and redeploy times
For more details, check out this article from RebelLabs.
Make an effort to configure your build path. Code completion uses a lot of memory if it has to go through your whole project folder.
Right click on your project and choose preferences.
Choose your build path setting and remove your project folder.
Then add only the folders where you have your source code and library code.
Not to be underrated is having a fast machine. 16-32 GB of RAM, SSD and a decent processor... and who0o0om there you go.
**Tips for making Eclipse IDE Faster**
Eclipse will run faster when working with small projects. But when you have to work with large project, you will get irritated with its speed. Even with a huge RAM you will not be happy with its
speed.Below steps will help eclipse to increase its speed
Remove unwanted activation of some of the plugins at start-up by going to windows–>preference–>General–>Startup and shutdown
also make sure you don’t use those plugins in any of your views
Disabling label decorations which is of less use for you, will also help you to gain some performance . Go to Windows–>Preference–>General–>Appearance–>Label -> Decorations
Close unwanted projects and use working set option to move from one group of project to another smoothly.
Configure eclipse.ini which will be available in the eclipse installed location.
Configuring eclipse.ini should be based on your RAM
-Xms256m
-Xmx512m
-XX:PermSize=512m
-XX:MaxPermSize=512M
Also have a look at http://wiki.eclipse.org/Eclipse.ini for more options
to configure eclipse.ini.
Do not keep lot of tabs opened in the editor. Better to have around 20 tabs . Regularly close the unused tabs. To open resource we can always use ctrl+shift+R and ctrl+shift+T (java resource) instead of opening lot of tabs
I experienced a considerable improvement in performance when limiting the number of open tabs (In the past I frequently had 30+ tabs open). You can let eclipse handle this for you automatically:
Window->Preferences->Editors-> close editors automatically
8 open tabs is the amount before the >> sign appears, so I set 14 as my default value.
When opening more tabs, the ones the least recently accessed will be closed. When all editors are dirty or pinned.
If it has unsaved modifications you can prompt to save & reuse (tab will be closed, a new one will be opened in its place). Or you can open a new editor end thus increase the amount of open tabs (the unobtrusive choice). If you want to ensure some tabs never get closed autmatically, you can pin them. This by clicking on the pin icon (the rightmost icon in the toolbar, with “pin editor” as tooltiptext).
Go to Windows -> Preferences -> Validation and uncheck any
validators
you don’t want or need.
Go to Windows -> Preferences -> General -> Appearance -> and uncheck any animation you don’t want or need.
Go to Windows -> Preferences -> Maven and check 'do not automatically update dependencies'.
I've disabled all unused options in Windows > Preferences > General and it has a huge positive impact on performance, eclipse is still slow when switching tabs, I don't want to increase memory, but it's a lot faster when scrolling. Thx for the tips.
Try this too, it will improve the performance:
cleaning up indexes - {workspace
path}.metadata.plugins\org.eclipse.jdt.core cleaning up history -
{workspace
path}.metadata.plugins\org.eclipse.core.resources.history
Cleaning the above folders will not impact the project files.
Well, if you are developing a GWT application using Eclipse, then this is the way:
Out of memory error in Eclipse
Also remember to add the same VM arguments to the hosted mode configuration.
If you use Maven and ivy do check out their consoles in case they are hogging processing during builds. I use ivy and on top of that I have certain JAR files (internal) changing with same version, so it has to workout all the time to fetch them.
If you have defined you project on a network drive then you will also experience lag during build/read/write type of processes.
Disable/uninstall plugins you don't need.
Close perpective that you don't need
Close unused database connections
In special cases, bad performance can be due to corrupt h2 or nwire databases. Read Five tips for speeding up Eclipse PDT and nWire for more information.
Where I work, we are dependent on a VM to run Debian. I have installed another Eclipse version on the VM for testing purpouses, but this sometimes creates conflicts if I have the other Eclipse version running. There is a shared folder which both of the Eclipse versions shares. I accidentally left the Debian Eclipse installation running in the background once and that gave me corrupt database files.
On Windows 8.
Open Control panel. Find Windows Defender. Go to settings
Exclude all folders where is your Spring/Eclipse and workspace
Apart from configuring eclipse.ini for memory usage. I have configured by "Start up & shutdown options". My Eclipse is blazing fast now.
The only real way to hasten Eclipse with the standard plug-ins is to give it more memory and in some cases access to a faster storage space / defragmented hard drive.
Beyond that there is not much you can do performance-wise: most standard plug-ins do not have a continuous runtime cost, even Mylyn is relatively fast.
Upgrading to the latest JVM supported on your machine may help as well.
Some people downgrade to older Eclipse versions to get better performance. It may also make sense to use Eclipse classic instead of the official releases.
Try these. There are two ways.
First Procedure
Refer this article.
http://www.javacodegeeks.com/2014/06/the-real-way-to-make-eclipse-run-faster-on-ubuntu.html
Second Procedure.
Execute the command in the terminal.
ramdisk
to get better performance and fast response for Ubuntu.
Ramdisk is part of system memory. Ubuntu by default uses a half of physical memory (RAM) as ramdisk, and it is mounted onto
/dev/shm
, it can be used just like normal disk space (create files and folders and manipulate them with better performance rather if they were stored on the hard disk). If ramdisk uses more than a half of RAM, data will be moved into the swap space. If ramdisk uses less, the remaining can still do what RAM’s doing.
Set upper limit of ramdisk
As is said above, ramdisk by default can use a half of RAM. If you want to change the upper limit, follow the steps below:
Edit /etc/fstab by your favourate editor:
gksudo gedit /etc/fstab
Find this line and change to make it looks like this(add this line if not exist, and change 512M to what you like.):
tmpfs /dev/shm tmpfs defaults,size=512M 0 0
Reboot or re-mount
/dev/shm
Mount /tmp onto ramdisk
To make it easy to use, you can mount a directory into
/dev/shm
by following commands:
mkdir /dev/shm/tmp
chmod 1777 /dev/shm/tmp
mount --bind /dev/shm/tmp /tmp