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POUI Component issue onPageLoad method ADF oracle
 

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    <p>I am facing problem in accessing the <code>UI component</code> (<code>button</code>) in the page in the <code>onPageLoad()</code> method. I am using ADF technology with JDveloper 11.1.2.3 the use case is:</p> <p>I am trying to disable or enable a button in page load based on information coming form the database. in my situation am executing a query that check if there is a stored file in the database; if there is a file, a button for downloading should be enabled which allow the user to download this file other wise the download button should be disabled. I tried the following code in <code>onPageLoad()</code> method:</p> <pre><code>public void onPageLoad() { // loading Previous file so the user have the option to download // if there is privous file stored in db if ((BlobDomain)tempVO.first().getAttribute("File1") != null) { System.out.println("ther is file stored in db from onPage load"); this.downloadButton.setDisabled(false); } else { // if there is no file stored the download option should be disapled System.out.println("no file stored in db from onPage load"); this.downloadButton.setDisabled(true); } </code></pre> <p><strong>and I got this errors after executing the previous code:</strong></p> <pre><code>&lt;UIXRegion&gt; &lt;_logIllegalContextChangeMessage&gt; ADF_FACES-10026:During the processing of the region component, either a context change was not found or it did not match the instance set up by the current component. Expected oracle.adf.view.rich.component.fragment.UIXRegion$RegionContextChange but found UIXCollection.CollectionComponentChange[Component class: oracle.adf.view.rich.component.rich.data.RichTable, component ID: t1]. &lt;RichExceptionHandler&gt; &lt;_logUnhandledException&gt; ADF_FACES-60098:Faces lifecycle receives unhandled exceptions in phase INVOKE_APPLICATION 5 oracle.jbo.JboException: JBO-29000: Unexpected exception caught: java.lang.NullPointerException, msg=null </code></pre>
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