Invalid PostConstruct annotation

Question

I have a xhtml page and in it i use informations that stored in a backing bean. but i need do some operation in bean construction before xhtml use thats. the operation consist retrieve data from database.
then i use a method for this operation and called it as search and annotated it with @PostConstruct. but when i call my xhtml page i get following Exception :

type Exception report

message An error occurred performing resource injection on managed bean MemberSearchControler

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: An error occurred performing resource injection on managed bean MemberSearchControler
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:659)
root cause

com.sun.faces.mgbean.ManagedBeanCreationException: An error occurred performing resource injection on managed bean MemberSearchControler
    com.sun.faces.mgbean.BeanBuilder.invokePostConstruct(BeanBuilder.java:227)
    com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:103)
    com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:409)
    com.sun.faces.mgbean.BeanManager.create(BeanManager.java:269)
    com.sun.faces.el.ManagedBeanELResolver.resolveBean(ManagedBeanELResolver.java:244)
    com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:116)
    com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
    com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
    org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:69)
    org.apache.el.parser.AstValue.getValue(AstValue.java:112)
    org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
    com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
    javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
    javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)
    javax.faces.component.UIData.getValue(UIData.java:732)
    javax.faces.component.UIData.getDataModel(UIData.java:1811)
    javax.faces.component.UIData.setRowIndexWithoutRowStatePreserved(UIData.java:484)
    javax.faces.component.UIData.setRowIndex(UIData.java:473)
    com.sun.faces.renderkit.html_basic.TableRenderer.encodeBegin(TableRenderer.java:82)
    javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:864)
    javax.faces.component.UIData.encodeBegin(UIData.java:1133)
    javax.faces.component.UIComponent.encodeAll(UIComponent.java:1894)
    javax.faces.render.Renderer.encodeChildren(Renderer.java:176)
    javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:889)
    javax.faces.component.UIComponent.encodeAll(UIComponent.java:1896)
    javax.faces.component.UIComponent.encodeAll(UIComponent.java:1899)
    javax.faces.component.UIComponent.encodeAll(UIComponent.java:1899)
    com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:451)
    com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
    javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
    org.apache.myfaces.tomahawk.application.ResourceViewHandlerWrapper.renderView(ResourceViewHandlerWrapper.java:169)
    com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
    com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:647)
root cause

com.sun.faces.spi.InjectionProviderException: java.lang.IllegalArgumentException: Invalid PostConstruct annotation


com.sun.faces.vendor.Tomcat6InjectionProvider.invokePostConstruct(Tomcat6InjectionProvider.java:120)    com.sun.faces.mgbean.BeanBuilder.invokePostConstruct(BeanBuilder.java:221)  com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:103)    com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:409)    com.sun.faces.mgbean.BeanManager.create(BeanManager.java:269)   com.sun.faces.el.ManagedBeanELResolver.resolveBean(ManagedBeanELResolver.java:244)  com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:116)     com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)  com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)   org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:69)  org.apache.el.parser.AstValue.getValue(AstValue.java:112)   org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)    com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)  javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)  javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)  javax.faces.component.UIData.getValue(UIData.java:732)  javax.faces.component.UIData.getDataModel(UIData.java:1811)     javax.faces.component.UIData.setRowIndexWithoutRowStatePreserved(UIData.java:484)   javax.faces.component.UIData.setRowIndex(UIData.java:473)   com.sun.faces.renderkit.html_basic.TableRenderer.encodeBegin(TableRenderer.java:82)     javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:864)     javax.faces.component.UIData.encodeBegin(UIData.java:1133)  javax.faces.component.UIComponent.encodeAll(UIComponent.java:1894)  javax.faces.render.Renderer.encodeChildren(Renderer.java:176)   javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:889)  javax.faces.component.UIComponent.encodeAll(UIComponent.java:1896)  javax.faces.component.UIComponent.encodeAll(UIComponent.java:1899)  javax.faces.component.UIComponent.encodeAll(UIComponent.java:1899)  com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:451)     com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)   javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)  org.apache.myfaces.tomahawk.application.ResourceViewHandlerWrapper.renderView(ResourceViewHandlerWrapper.java:169)  com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)   com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)   com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)    javax.faces.webapp.FacesServlet.service(FacesServlet.java:647) root cause

java.lang.IllegalArgumentException: Invalid PostConstruct annotation    org.apache.catalina.util.DefaultAnnotationProcessor.postConstruct(DefaultAnnotationProcessor.java:85)   com.sun.faces.vendor.Tomcat6InjectionProvider.invokePostConstruct(Tomcat6InjectionProvider.java:118)    com.sun.faces.mgbean.BeanBuilder.invokePostConstruct(BeanBuilder.java:221)  com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:103)    com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:409)    com.sun.faces.mgbean.BeanManager.create(BeanManager.java:269)   com.sun.faces.el.ManagedBeanELResolver.resolveBean(ManagedBeanELResolver.java:244)  com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:116)     com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)  com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)   org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:69)  org.apache.el.parser.AstValue.getValue(AstValue.java:112)   org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)    com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)  javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)  javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)  javax.faces.component.UIData.getValue(UIData.java:732)  javax.faces.component.UIData.getDataModel(UIData.java:1811)     javax.faces.component.UIData.setRowIndexWithoutRowStatePreserved(UIData.java:484)   javax.faces.component.UIData.setRowIndex(UIData.java:473)   com.sun.faces.renderkit.html_basic.TableRenderer.encodeBegin(TableRenderer.java:82)     javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:864)     javax.faces.component.UIData.encodeBegin(UIData.java:1133)  javax.faces.component.UIComponent.encodeAll(UIComponent.java:1894)  javax.faces.render.Renderer.encodeChildren(Renderer.java:176)   javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:889)  javax.faces.component.UIComponent.encodeAll(UIComponent.java:1896)  javax.faces.component.UIComponent.encodeAll(UIComponent.java:1899)  javax.faces.component.UIComponent.encodeAll(UIComponent.java:1899)  com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:451)     com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)   javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)  org.apache.myfaces.tomahawk.application.ResourceViewHandlerWrapper.renderView(ResourceViewHandlerWrapper.java:169)  com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)   com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)   com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)    javax.faces.webapp.FacesServlet.service(FacesServlet.java:647) note The full stack trace of the root cause is available in the Apache Tomcat/6.0.37 logs.

and this is my backing bean :

ManagedBean(name="MemberSearchControler")
@SessionScoped
public class MemebrSearchControl {

    public MemebrSearchControl(){
        System.out.println("Test");
    }

    private String text;
    private List<Member> members;

    //For Create CheckBox
    private int[] membersId;
    public int[] getMembersId() {
        return membersId;
    }

    //For get Selected Member Id
    private int[] selectedMembers;
    public void setSelectedMember(int[] ids) {
        selectedMembers=ids;
    }   

    public List<Member> getMembers() {
        return members;
    }
    public int getMembersCount() {
        return membersCount;
    }

    private int membersCount;

    public String getText() {
        return text;
    }
    public void setText(String text) {
        this.text = text;
    }


    @PostConstruct
    public String search() throws DaoImplNotFoundException, DataSourceException{
        MemberDao dao=(MemberDao) Factory.getDao(ConfigReader.getConfig().getProperty("dao.member"));
        members=dao.list(1, 10);
        membersId=new int[members.size()];
        for(int i=0;i<members.size();i++)
            membersId[i]=members.get(i).getId();
        return "member";
    }


}

skuntsel skuntsel · Accepted Answer · 2013-11-29T19:41:35

It's always helpful to read the documentation, more specifically these lines (emphasis mine):

The method on which the PostConstruct annotation is applied MUST fulfill all of the following criteria - - The method MUST NOT have any parameters except in the case of EJB interceptors in which case it takes an InvocationC ontext object as defined by the EJB specification. - The return type of the method MUST be void. - The method MUST NOT throw a checked exception... (other requirements omitted)

So, at least the return type requirement is not met (we do not know whether your exceptions are checked or not, so I removed them in case they are, but in this case you do need to handle the exception in the method).

All in all, replace your method with

@PostConstruct
public void search() {
    MemberDao dao=(MemberDao) Factory.getDao(ConfigReader.getConfig().getProperty("dao.member"));
    members=dao.list(1, 10);
    membersId=new int[members.size()];
    for(int i=0;i<members.size();i++)
        membersId[i]=members.get(i).getId();
}

Basing on your comment, your exception classes are checked exceptions. So you have to either introduce a try-catch block in your method, or let your exceptions inherit from RuntimeException. If you choose the former way you can rethrow an unchecked exception like IllegalStateException, or, for example, send a redirect in case it's not too late:

@PostConstruct
public void search() {
    try {
        MemberDao dao=(MemberDao) Factory.getDao(ConfigReader.getConfig().getProperty("dao.member"));
        members=dao.list(1, 10);
        membersId=new int[members.size()];
        for(int i=0;i<members.size();i++)
            membersId[i]=members.get(i).getId();
    } catch(DaoImplNotFoundException dinf) {
        //option one
        throw new IllegalStateException("Something went wrong.");
        //option two
        FacesContext.getCurrentInstance().getExternalContext().redirect("/error.xhtml");
    } //other exception types
}

Invalid PostConstruct annotation

1 Answers