Building Project Error On STS 4.7.1 Or Eclipse EE 2020-06

[noxymon]

Error occured when building project/adding nature of thymeleaf. either on STS 4.7.1 or Eclipse EE 2020-06 already switched from java oracle/openjdk, with same result.

stacktrace :

java.lang.IllegalAccessError: tried to access method org.thymeleaf.extras.eclipse.builder.ThymeleafBuilder.unvalidateProject(Lorg/eclipse/jdt/core/IJavaProject;Lorg/eclipse/core/runtime/IProgressMonitor;)V from class org.thymeleaf.extras.eclipse.builder.ThymeleafBuilder$unvalidateProject at org.thymeleaf.extras.eclipse.builder.ThymeleafBuilder$unvalidateProject.callCurrent(Unknown Source) at org.thymeleaf.extras.eclipse.builder.ThymeleafBuilder.build(ThymeleafBuilder.groovy:85) at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:832) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:220) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:263) at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:316) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:319) at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:371) at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:392) at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:154) at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:244) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

Session Data :

eclipse.buildId=4.7.1.202007271558-RELEASE java.version=1.8.0_261 java.vendor=Oracle Corporation BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US Framework arguments: -product org.springframework.boot.ide.branding.sts4 Command-line arguments: -os linux -ws gtk -arch x86_64 -product org.springframework.boot.ide.branding.sts4