NPE in CDI (probably) Validation -------------------------------- Key: JBIDE-18747 URL: https://issues.jboss.org/browse/JBIDE-18747 Project: Tools (JBoss Tools) Issue Type: Bug Components: cdi, jsp/jsf/xml/html source editing Affects Versions: 4.2.0.Final Reporter: Victor Rubezhny Assignee: Alexey Kazakov Fix For: 4.2.1.Final, 4.3.0.Alpha1 In some cases, when you're editing HTML Validation Preferences and agree to perform a build on pressing 'Apply' and then immediately do the same on pressing 'OK' button, an NPE occurs in Validation: {code} !ENTRY org.jboss.tools.common 4 0 2014-11-13 02:17:31.326 !MESSAGE !STACK 0 org.jboss.tools.common.validation.JBTValidationException at org.jboss.tools.common.validation.ValidatorManager.validate(ValidatorManager.java:123) at org.jboss.tools.common.validation.ValidatorManager.validateInJob(ValidatorManager.java:81) at org.eclipse.wst.validation.internal.core.ValidatorLauncher.start(ValidatorLauncher.java:77) at org.eclipse.wst.validation.Validator$V1.validate(Validator.java:768) at org.eclipse.wst.validation.Validator.validate(Validator.java:405) at org.eclipse.wst.validation.internal.ValManager.validate(ValManager.java:704) at org.eclipse.wst.validation.internal.ValManager$1.visit(ValManager.java:665) at org.eclipse.wst.validation.internal.ValManager.accept(ValManager.java:783) at org.eclipse.wst.validation.internal.ValManager.validate(ValManager.java:669) at org.eclipse.wst.validation.internal.ValidationRunner.execute(ValidationRunner.java:134) at org.eclipse.wst.validation.internal.ValidationRunner.run(ValidationRunner.java:148) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2313) at org.eclipse.wst.validation.internal.ValidationRunner.validate(ValidationRunner.java:67) at org.eclipse.wst.validation.ValidationFramework.validate(ValidationFramework.java:661) at org.eclipse.wst.sse.ui.internal.preferences.ui.AbstractValidationSettingsPage$ValidateJob.run(AbstractValidationSettingsPage.java:411) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54) Caused by: java.lang.NullPointerException at org.jboss.tools.common.validation.ValidatorManager.validate(ValidatorManager.java:116) ... 15 more {code} Some debugging shows that NPE happens when validator is CDICoreValidator object: the following expression: {code}validationHelper.getValidationContextManager().getValidatingProjectTree(validator){code}, and that value is used with no any checks for that.