Error While validating XHTML Files in Eclipse OEPE (Mars & Neon)

LittlePenguin

I'm suffering the error explained in this question of Stackoverflow.

Summarizing, when validating an xhtml or an entire dynamic webproject a window error appear with the error:

"An internal error occurred during: "Validating".

Could not initialize class org.apache.myfaces.shared.config.MyfacesConfig"

In Stackoverflow they correct a MANIFEST.MF file located inside a jar (I think in Neon must be plugins/oracle.eclipse.tools.webtier.jsf.facelet_15.7.1.201606271248.jar)

The problem is the solution explained in Stackoverflow doesn't solve my error.

I have also tried to edit manually the MANIFEST.MF of the jar and delete the text ".tests" of all packages.

I'm using:

  -oepe-12.2.1.3-neon-distro-linux-gtk-x86_64 (Eclipse Version: Neon (4.6) Build id: I20160606-1100, oepe plugin version 15.7.1.201606271248)

  -Java 1.8.0_65-b17

In the past I had the same problem with Eclipse Mars

Ian Trimble-Oracle

OEPE facelet validation makes use of the MyFaces JSF implementation, and the javax.servlet implementation. In the example project, JSF and Servlet libraries are declared as dependencies. Some classes from these libraries are loaded into the VM ahead of OEPE’s classes, and the problem occurs.

We see one of these per VM lifetime:

An internal error occurred during: "Validating".

Absent Code attribute in method that is not native or abstract in class file javax/faces/application/Application

Followed by one of these for every validation run:

An internal error occurred during: "Validating".

Could not initialize class org.apache.myfaces.shared.config.MyfacesConfig

The reason there is a problem is hinted at by the initial error – the classes loaded by Maven ahead of OEPE’s own classes have been stripped of code, making them useful only to compile against but useless at runtime.

Why would there be such classes? I have still not found an authoritative answer to that, but they are provided to the Maven central repository and I have read many websites out there discussing related issues. Here are a few:

https://developer.jboss.org/wiki/WhatsTheCauseOfThisExceptionJavalangClassFormatErrorAbsentCode?_sscc=t

http://dominikdorn.com/2010/05/maven-junit-classformaterror-absent-code-attribute/

http://stackoverflow.com/questions/7807549/java-lang-classformaterror-absent-code-attribute-in-method-that-is-not-native-o

The workaround appears to be to use different dependencies in the POM, and pull in libraries that have full class information that can be used at runtime. In the case of the example project, I recommend the following replacements:

• Remove both JSF artifacts and replace with org.glassfish:javax.faces:2.1.6
• Remove the Servlet artifact and replace with org.glassfish:javax.servlet:3.0.1

Shabari S-Oracle

Could you please send the projects with which you are able to reproduce this error.

LittlePenguin

Hi, I'm sorry for the delay.

I've prepared a simple project to reproduce the error. How can I send/attach it?

Shabari S-Oracle

Try sending it through this FTP site https://www.sharefile.com/. You need to create an account though or may be through dropbox

LittlePenguin

Alright!

Here you have it: https://www.dropbox.com/s/j09m46rz7ykren7/validation-test-jsf.zip?dl=0

This is a simple dynamic web project. It has only 1 xhtml and this has only the head definition of namespaces.

Its weird. If I follow the steps:

1.- Open Eclipse/the project > validate => I obtain the error.

2.- If I delete de namespaces > save the file > validate => I obtain no error.

3.- then I add the exact namespace definitions > validate => again no error.

4.- Close the project and open again > validate => this time I have the error.

Shabari S-Oracle

I tried reproducing it on  the last OEPE 122131 GA build both on Mars and Neon. After I imported the project , I selected the project->Right Click->Validate.And Validation Results windows came up saying 'Validation completed with no errors or warnings.". So I am not able to see the error what you are seeing. The Java version what I am using is 1.8.0-91. Can you try updating your java version and see if you still see the error.

LittlePenguin

Updated to jdk 8_102. Same error:

https://www.dropbox.com/s/2mgva9bnf3xrjfu/MyfacesError.zip?dl=0

LittlePenguin

Hello,

I've made a fresh install of oepe (12.2.1.3.1) using the same workspace, the same eclipse.ini and now the error does NOT reproduces. If I return to the previous version I get the error back.

Can it be a resolved bug?  can it be a configuration file/option corrupted by an unknown reason?

In any case, the problem seems to be localized in the instal·lation directory of eclipse. Am I right?

For now my problem has disappeared. I've made a backup of the instal·lation directory and if in the future I get the error back, I will be able to compare both of them to search differences.

LittlePenguin

1 hour is the time I've lasted to reproduce the error again.

Comparing the backup directory and the new one shows... nothing!! (only some .png files).

Shabari, when you tried to reproduce the error, did you close and reopen the project? did you close and reopen Eclipse? Are you using Linux?

LittlePenguin

Mmmm I think I've found an important factor:

I'm running Eclipse with JDK8 BUT I'm developing a JDK7 application, so I've found that the error appear when I install the JDK7 virtual machine, I put it as the default JVM and then run the validation.

Shabari S-Oracle

OEPE does require JDK 8 . I was trying to reproduce it on my windows machine . I am glad you were able to narrow down the issue.