Whenever I'm launching my eclipse IDE with my project workspace, there is one popup window showing some internal error with the task scheduler. I'm attaching the picture of that popup window here.
My project is all in java language and also uses spring boot in it.
The error says something like
An internal error occurred during: "SSE core task scheduler startup"
Sorry I'm not able to add a direct image for this as Stack overflow is not allowing me to do that.
Maybe a missing or an outdated plugin. You should verify your ICU4J plugin version (menu: Help -> About Eclipse IDE -> Installation Details -> plugins).
If "Eclipse Orbit" plugin version is older than "Unicode, Inc" version check for missing/outdated software site and add/update "Eclipse Orbit" https://download.eclipse.org/tools/orbit/downloads/2022-09.
Then check for new updates or install ICU4J.
Running with temurin-18.jdk on MacOS, stack below.
Offending call to new StringTokenizer(..):
Looks like an errant import from com.ibm instead of java.util.StringTokenizer:
import com.ibm.icu.util.StringTokenizer;
Stack:
!ENTRY org.eclipse.core.jobs 4 2 2022-09-22 08:11:42.471
!MESSAGE An internal error occurred during: "SSE core task scheduler startup".
!STACK 0
java.lang.NoClassDefFoundError: com/ibm/icu/util/StringTokenizer
at org.eclipse.wst.sse.core.utils.StringUtils.unpack(StringUtils.java:777)
at org.eclipse.wst.sse.core.internal.tasks.TaskScanningJob.getScannedProjects(TaskScanningJob.java:295)
at org.eclipse.wst.sse.core.internal.tasks.TaskScanningJob.projectHasNotBeenFullyScanned(TaskScanningJob.java:152)
at org.eclipse.wst.sse.core.internal.tasks.TaskScanningJob.addProject(TaskScanningJob.java:118)
at org.eclipse.wst.sse.core.internal.tasks.TaskScanningScheduler.enqueue(TaskScanningScheduler.java:137)
at org.eclipse.wst.sse.core.internal.tasks.TaskScanningScheduler.startup(TaskScanningScheduler.java:117)
at org.eclipse.wst.sse.core.internal.SSECorePlugin.lambda$0(SSECorePlugin.java:96)
at org.eclipse.core.runtime.jobs.Job$1.run(Job.java:166)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)
Caused by: java.lang.ClassNotFoundException: com.ibm.icu.util.StringTokenizer cannot be found by org.eclipse.wst.sse.core_1.2.800.v202207121749
at org.eclipse.osgi.internal.loader.BundleLoader.generateException(BundleLoader.java:541)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass0(BundleLoader.java:487)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:416)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:168)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
... 9 more
For me, Eclipse was almost working until these two updates occurred:
Mylyn WikiText 3.0.43.202209151832 org.eclipse.mylyn.wikitext_feature.feature.group Eclipse Mylyn
M2E - Maven Integration for Eclipse 2.0.5.20220912-1211 org.eclipse.m2e.feature.feature.group Eclipse.org - m2e
The StringTokenizer error appeared immediately after Eclipse restarted.
(I emphasize almost because M2E was never copying the Maven Dependencies into the WEB-INF/lib of my configured server.)
This error caused lot of issues to me like unable to open jsp editor in Eclipse, multiple crashes when autocomplete is selected.
This is what i did..
First go to Menu Bar > Help > Install New Software > Manage Button in Eclipse.
Search for m2e. There may be one item with icon and without any name. Click on edit and then update the url to http://download.eclipse.org/technology/m2e/releases/latest . Click on Add and then Apply and close and then Finish.
As suggested by user @EG-IT,
Now Go to Menu Bar > Help > Install New Software in Eclipse. In the work with text area insert this link https://download.eclipse.org/tools/orbit/downloads/2022-09. If drop down menu appears then fine, If not add a space and press backspace now a drop down should appear.
Select the option with orbit - https://download.eclipse.org/tools/orbit/downloads/2022-09
Click on the Select All button on the right and click Next button. Select all items if prompted to install. Agree to term and conditions, wait till updates are installed. Restart IDE.
If same error persists please update the Eclipse.
I hope this detailed explanation works.
I had the same problem today.
Updating Eclipse solved it for me:
Help -> About Eclipse -> Installation Details -> Update
This is the exact same thing from the below link, if you want to know more check here
Run the System File Checker tool (SFC.exe) To do this, follow these steps:
Open an elevated command prompt. To do this, do the following as your appropriate:
If you are running Windows 10, Windows 8.1 or Windows 8, first run the inbox Deployment Image Servicing and Management (DISM) tool prior to running the System File Checker. (If you are running Windows 7 or Windows Vista, skip to Step 3.)
Type the following command, and then press Enter. It may take several minutes for the command operation to be completed.
DISM.exe /Online /Cleanup-image /Restorehealth
Important: When you run this command, DISM uses Windows Update to provide the files that are required to fix corruptions. However, if your Windows Update client is already broken, use a running Windows installation as the repair source, or use a Windows side-by-side folder from a network share or from a removable media, such as the Windows DVD, as the source of the files. To do this, run the following command instead:
DISM.exe /Online /Cleanup-Image /RestoreHealth /Source:C:\RepairSource\Windows /LimitAccess
Note: Replace the C:\RepairSource\Windows placeholder with the location of your repair source. For more information about using the DISM tool to repair Windows, reference Repair a Windows Image.
At the command prompt, type the following command, and then press ENTER:
sfc /scannow
The sfc /scannow command will scan all protected system files, and replace corrupted files with a cached copy that is located in a compressed folder at %WinDir%\System32\dllcache. The %WinDir% placeholder represents the Windows operating system folder. For example, C:\Windows.
Note Do not close this Command Prompt window until the verification is 100% complete. The scan results will be shown after this process is finished.
After the process is finished, you may receive one of the following messages:
Windows Resource Protection did not find any integrity violations.
This means that you do not have any missing or corrupted system files.
Windows Resource Protection could not perform the requested operation.
To resolve this problem, perform the System File Checker scan in safe mode, and make sure that the PendingDeletes and PendingRenames folders exist under %WinDir%\WinSxS\Temp.
Windows Resource Protection found corrupt files and successfully repaired them. Details are included in the CBS.Log %WinDir%\Logs\CBS\CBS.log.
To view the detail information about the system file scan and restoration, go to How to view details of the System File Checker process.
Windows Resource Protection found corrupt files but was unable to fix some of them. Details are included in the CBS.Log %WinDir%\Logs\CBS\CBS.log.
To repair the corrupted files manually, view details of the System File Checker process to find the corrupted file, and then manually replace the corrupted file with a known good copy of the file.