On projects with builders JavaScript Validator and Validation xml files are validated twice and error markers are duplicated [EBZ#495625] ----------------------------------------------------------------------------------------------------------------------------------------- Key: ERT-428 URL: https://issues.jboss.org/browse/ERT-428 Project: Eclipse Release Train Issue Type: Task Components: JSDT Reporter: Friendly Jira Robot Assignee: Victor Rubezhny Labels: General, bzira Fix For: Neon.1 (4.6) When a project has enabled builders JavaScript Validator and Validation, org.eclipse.wst.xml.core.internal.validation.eclipse.Validator is called twice from org.eclipse.wst.validation.internal.ValManager and all results are summed. As the result, validation error messages are duplicated. ValBuilderJob.runInWorkspace() has a loop in which it repeats validation until getRequest() returns null. Then ValManager.validate(IProject,...) calls delete markers, but it works only for the first call, it is designed to accumulate markers created in multiple calls from ValBuilderJob during the same build. Two requests that make the same file to be validated twice come independently from 1) org.eclipse.wst.validation.internal.operations.ValidationBuilder 2) org.eclipse.wst.jsdt.internal.core.builder.JavaBuilder by method newBuild(). When I disable JavaScript Validator in project properties in section Builders, there is no more duplication of markers.