I am using JBoss Development Studio Version: 8.0.0.Beta1 that comes with | Dali Java Persistence Tools - JPA Support | 3.4.0.v201401221940-7V7dEpFC7sReAYthMgWBL39c7 | When I try to generate entities from tables I get erros associated with contraints that shouldnt´s be happening. It seems to be a problem with JPA or Dali.  I attached the database structure to this post to make it easier to try to reproduce the problem if anyone wishes to. the Platform is Hibernate(JPA 2.1) I have 3 erros written below. Any ideas of how to fix this wierd behaviour? *Error #01* {code:jivemacro_uid=_14056960246948738|class=jive_text_macro jive_macro_code _jivemacro_uid_14056960246948738} org.apache.velocity.exception.MethodInvocationException: Invocation of method 'getImportStatements' in  class org.eclipse.jpt.jpa.gen.internal.ORMGenTable threw exception java.lang.IllegalStateException: aluno_x_disciplina.FK_IDDISCIPLINA_ALUNODISCIPLINA - mismatched sizes: 1 vs. 2 @ main.java.vm[7,9]   at org.apache.velocity.runtime.parser.node.ASTIdentifier.execute(ASTIdentifier.java:205)   at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203)   at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:294)   at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)   at org.apache.velocity.Template.merge(Template.java:254)   at org.apache.velocity.app.VelocityEngine.mergeTemplate(VelocityEngine.java:508)   at org.apache.velocity.app.VelocityEngine.mergeTemplate(VelocityEngine.java:473)   at org.eclipse.jpt.jpa.gen.internal.PackageGenerator.generateJavaFile(PackageGenerator.java:333)   at org.eclipse.jpt.jpa.gen.internal.PackageGenerator.generateClass(PackageGenerator.java:310)   at org.eclipse.jpt.jpa.gen.internal.PackageGenerator.generateInternal(PackageGenerator.java:132)   at org.eclipse.jpt.jpa.gen.internal.PackageGenerator.doGenerate(PackageGenerator.java:106)   at org.eclipse.jpt.jpa.gen.internal.PackageGenerator.generate(PackageGenerator.java:82)   at org.eclipse.jpt.jpa.ui.internal.wizards.gen.GenerateEntitiesFromSchemaWizard$GenerateEntitiesJob.runInWorkspace(GenerateEntitiesFromSchemaWizard.java:285)   at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)   at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54) Caused by: java.lang.IllegalStateException: aluno_x_disciplina.FK_IDDISCIPLINA_ALUNODISCIPLINA - mismatched sizes: 1 vs. 2   at org.eclipse.jpt.jpa.db.internal.DTPForeignKeyWrapper.buildColumnPairArray(DTPForeignKeyWrapper.java:116)   at org.eclipse.jpt.jpa.db.internal.DTPForeignKeyWrapper.getColumnPairArray(DTPForeignKeyWrapper.java:106)   at org.eclipse.jpt.jpa.db.internal.DTPForeignKeyWrapper.getLocalColumnPairs(DTPForeignKeyWrapper.java:101)   at org.eclipse.jpt.jpa.db.internal.DTPForeignKeyWrapper.getBaseColumns(DTPForeignKeyWrapper.java:146)   at org.eclipse.jpt.jpa.db.internal.DTPForeignKeyWrapper.baseColumnsContains(DTPForeignKeyWrapper.java:150)   at org.eclipse.jpt.jpa.db.internal.DTPTableWrapper.foreignKeyBaseColumnsContains(DTPTableWrapper.java:216)   at org.eclipse.jpt.jpa.db.internal.DTPColumnWrapper.isPartOfForeignKey(DTPColumnWrapper.java:58)   at org.eclipse.jpt.jpa.gen.internal.ORMGenColumn.isForeignKey(ORMGenColumn.java:266)   at org.eclipse.jpt.jpa.gen.internal.ORMGenTable.buildColumnTypesMap(ORMGenTable.java:206)   at org.eclipse.jpt.jpa.gen.internal.ORMGenTable.getImportStatements(ORMGenTable.java:138)   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)   at java.lang.reflect.Method.invoke(Method.java:601)   at org.apache.velocity.runtime.parser.node.PropertyExecutor.execute(PropertyExecutor.java:137)   at org.apache.velocity.util.introspection.UberspectImpl$VelGetterImpl.invoke(UberspectImpl.java:350)   at org.apache.velocity.runtime.parser.node.ASTIdentifier.execute(ASTIdentifier.java:180)   ... 14 more {code} *Error #02* {code:jivemacro_uid=_14056960332731901|class=jive_text_macro jive_macro_code _jivemacro_uid_14056960332731901} org.apache.velocity.exception.MethodInvocationException: Invocation of method 'isDefault' in  class org.eclipse.jpt.jpa.gen.internal.ORMGenColumn threw exception java.lang.IllegalStateException: disciplina_x_prereq.FK_DISCIPLINA_DISCPREREQ - mismatched sizes: 1 vs. 2 @ column.vm[21,16]   at org.apache.velocity.runtime.parser.node.ASTIdentifier.execute(ASTIdentifier.java:205)   at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203)   at org.apache.velocity.runtime.parser.node.ASTReference.evaluate(ASTReference.java:396)   at org.apache.velocity.runtime.parser.node.ASTNotNode.evaluate(ASTNotNode.java:64)   at org.apache.velocity.runtime.parser.node.ASTOrNode.evaluate(ASTOrNode.java:99)   at org.apache.velocity.runtime.parser.node.ASTExpression.evaluate(ASTExpression.java:64)   at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:86)   at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)   at org.apache.velocity.runtime.directive.Parse.render(Parse.java:224)   at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170)   at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)   at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:88)   at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)   at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:448)   at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170)   at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)   at org.apache.velocity.Template.merge(Template.java:254)   at org.apache.velocity.app.VelocityEngine.mergeTemplate(VelocityEngine.java:508)   at org.apache.velocity.app.VelocityEngine.mergeTemplate(VelocityEngine.java:473)   at org.eclipse.jpt.jpa.gen.internal.PackageGenerator.generateJavaFile(PackageGenerator.java:333)   at org.eclipse.jpt.jpa.gen.internal.PackageGenerator.generateClass(PackageGenerator.java:314)   at org.eclipse.jpt.jpa.gen.internal.PackageGenerator.generateInternal(PackageGenerator.java:132)   at org.eclipse.jpt.jpa.gen.internal.PackageGenerator.doGenerate(PackageGenerator.java:106)   at org.eclipse.jpt.jpa.gen.internal.PackageGenerator.generate(PackageGenerator.java:82)   at org.eclipse.jpt.jpa.ui.internal.wizards.gen.GenerateEntitiesFromSchemaWizard$GenerateEntitiesJob.runInWorkspace(GenerateEntitiesFromSchemaWizard.java:285)   at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)   at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54) Caused by: java.lang.IllegalStateException: disciplina_x_prereq.FK_DISCIPLINA_DISCPREREQ - mismatched sizes: 1 vs. 2   at org.eclipse.jpt.jpa.db.internal.DTPForeignKeyWrapper.buildColumnPairArray(DTPForeignKeyWrapper.java:116)   at org.eclipse.jpt.jpa.db.internal.DTPForeignKeyWrapper.getColumnPairArray(DTPForeignKeyWrapper.java:106)   at org.eclipse.jpt.jpa.db.internal.DTPForeignKeyWrapper.getLocalColumnPairs(DTPForeignKeyWrapper.java:101)   at org.eclipse.jpt.jpa.db.internal.DTPForeignKeyWrapper.getBaseColumns(DTPForeignKeyWrapper.java:146)   at org.eclipse.jpt.jpa.db.internal.DTPForeignKeyWrapper.baseColumnsContains(DTPForeignKeyWrapper.java:150)   at org.eclipse.jpt.jpa.db.internal.DTPTableWrapper.foreignKeyBaseColumnsContains(DTPTableWrapper.java:216)   at org.eclipse.jpt.jpa.db.internal.DTPColumnWrapper.isPartOfForeignKey(DTPColumnWrapper.java:58)   at org.eclipse.jpt.jpa.gen.internal.ORMGenColumn.isForeignKey(ORMGenColumn.java:266)   at org.eclipse.jpt.jpa.gen.internal.ORMGenColumn.isUpdateable(ORMGenColumn.java:373)   at org.eclipse.jpt.jpa.gen.internal.ORMGenColumn.isDefault(ORMGenColumn.java:128)   at sun.reflect.GeneratedMethodAccessor54.invoke(Unknown Source)   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)   at java.lang.reflect.Method.invoke(Method.java:601)   at org.apache.velocity.runtime.parser.node.PropertyExecutor.execute(PropertyExecutor.java:137)   at org.apache.velocity.util.introspection.UberspectImpl$VelGetterImpl.invoke(UberspectImpl.java:350)   at org.apache.velocity.runtime.parser.node.ASTIdentifier.execute(ASTIdentifier.java:180)   ... 26 more {code} *Error #03* {code:jivemacro_uid=_14056960466417767|class=jive_text_macro jive_macro_code _jivemacro_uid_14056960466417767} org.apache.velocity.exception.MethodInvocationException: Invocation of method 'getImportStatements' in  class org.eclipse.jpt.jpa.gen.internal.ORMGenTable threw exception java.lang.IllegalStateException: disciplinasoferecidas.FK_DISCOFF_DISC - mismatched sizes: 1 vs. 2 @ main.java.vm[7,9]   at org.apache.velocity.runtime.parser.node.ASTIdentifier.execute(ASTIdentifier.java:205)   at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203)   at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:294)   at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)   at org.apache.velocity.Template.merge(Template.java:254)   at org.apache.velocity.app.VelocityEngine.mergeTemplate(VelocityEngine.java:508)   at org.apache.velocity.app.VelocityEngine.mergeTemplate(VelocityEngine.java:473)   at org.eclipse.jpt.jpa.gen.internal.PackageGenerator.generateJavaFile(PackageGenerator.java:333)   at org.eclipse.jpt.jpa.gen.internal.PackageGenerator.generateClass(PackageGenerator.java:310)   at org.eclipse.jpt.jpa.gen.internal.PackageGenerator.generateInternal(PackageGenerator.java:132)   at org.eclipse.jpt.jpa.gen.internal.PackageGenerator.doGenerate(PackageGenerator.java:106)   at org.eclipse.jpt.jpa.gen.internal.PackageGenerator.generate(PackageGenerator.java:82)   at org.eclipse.jpt.jpa.ui.internal.wizards.gen.GenerateEntitiesFromSchemaWizard$GenerateEntitiesJob.runInWorkspace(GenerateEntitiesFromSchemaWizard.java:285)   at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)   at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54) Caused by: java.lang.IllegalStateException: disciplinasoferecidas.FK_DISCOFF_DISC - mismatched sizes: 1 vs. 2   at org.eclipse.jpt.jpa.db.internal.DTPForeignKeyWrapper.buildColumnPairArray(DTPForeignKeyWrapper.java:116)   at org.eclipse.jpt.jpa.db.internal.DTPForeignKeyWrapper.getColumnPairArray(DTPForeignKeyWrapper.java:106)   at org.eclipse.jpt.jpa.db.internal.DTPForeignKeyWrapper.getLocalColumnPairs(DTPForeignKeyWrapper.java:101)   at org.eclipse.jpt.jpa.db.internal.DTPForeignKeyWrapper.getBaseColumns(DTPForeignKeyWrapper.java:146)   at org.eclipse.jpt.jpa.db.internal.DTPForeignKeyWrapper.baseColumnsContains(DTPForeignKeyWrapper.java:150)   at org.eclipse.jpt.jpa.db.internal.DTPTableWrapper.foreignKeyBaseColumnsContains(DTPTableWrapper.java:216)   at org.eclipse.jpt.jpa.db.internal.DTPColumnWrapper.isPartOfForeignKey(DTPColumnWrapper.java:58)   at org.eclipse.jpt.jpa.gen.internal.ORMGenColumn.isForeignKey(ORMGenColumn.java:266)   at org.eclipse.jpt.jpa.gen.internal.ORMGenTable.buildColumnTypesMap(ORMGenTable.java:206)   at org.eclipse.jpt.jpa.gen.internal.ORMGenTable.getImportStatements(ORMGenTable.java:138)   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)   at java.lang.reflect.Method.invoke(Method.java:601)   at org.apache.velocity.runtime.parser.node.PropertyExecutor.execute(PropertyExecutor.java:137)   at org.apache.velocity.util.introspection.UberspectImpl$VelGetterImpl.invoke(UberspectImpl.java:350)   at org.apache.velocity.runtime.parser.node.ASTIdentifier.execute(ASTIdentifier.java:180)   ... 14 more {code} Posted by forums Original post: https://community.jboss.org/message/881680#881680