You don't specify which object you've found to be null... but anyway, let me try...
looking at the FormFocus.script code from http://tapestry.apache.org/tapestry4.1/components/general/script.html i see ${component.form.name} and ${component.name}, so either component or component.form is null (according to the error message) Looking at the javadocs for AbstractFormComponent http://tapestry.apache.org/tapestry4.1/apidocs/org/apache/tapestry/form/AbstractFormComponent.html I read getForm() : returns the IForm which contains the component, or null if the component is not contained by a form, or if the containing Form is not currently rendering. Finally, looking at your code I see that @Script is outside the @Form, so according to the javadocs, getForm() should indeed return null ! The cure? move the @Script inside @Form - or rewrite the script so that it doesn't use getForm() perhaps... On Wed, Dec 30, 2009 at 23:35, Ivano Luberti <lube...@archicoop.it> wrote: > Thanks Andreas , the problem is that everything works until I insert the > javascript. > In fact the exception is thrown inside the Script implementation. Down > here you'll find the init part of the srtack trace. > I was wondering if not using the @Body in the component html template is > correct, given the fact that it is used in the html template of the page > that call the component. > > > > > * ognl.OgnlRuntime.getProperty(OgnlRuntime.java:2203) > * ognl.ASTProperty.getValueBody(ASTProperty.java:114) > * ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212) > * ognl.SimpleNode.getValue(SimpleNode.java:258) > * ognl.ASTChain.getValueBody(ASTChain.java:141) > * ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212) > * ognl.SimpleNode.getValue(SimpleNode.java:258) > * ognl.Ognl.getValue(Ognl.java:494) > * ognl.Ognl.getValue(Ognl.java:458) > * > org.apache.tapestry.services.impl.ExpressionEvaluatorImpl.readCompiled(ExpressionEvaluatorImpl.java:123) > > * > org.apache.tapestry.services.impl.ExpressionEvaluatorImpl.read(ExpressionEvaluatorImpl.java:112) > > * > $ExpressionEvaluator_125e178e557.read($ExpressionEvaluator_125e178e557.java) > > * > org.apache.tapestry.script.ScriptSessionImpl.evaluate(ScriptSessionImpl.java:86) > > * org.apache.tapestry.script.AbstractToken.evaluate(AbstractToken.java:84) > > * org.apache.tapestry.script.InsertToken.write(InsertToken.java:48) > * > org.apache.tapestry.script.AbstractToken.writeChildren(AbstractToken.java:71) > > * org.apache.tapestry.script.LetToken.write(LetToken.java:53) > * > org.apache.tapestry.script.AbstractToken.writeChildren(AbstractToken.java:71) > > * org.apache.tapestry.script.ParsedScript.execute(ParsedScript.java:82) > * org.apache.tapestry.html.Script.renderComponent(Script.java:159) > * org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:724) > > * > org.apache.tapestry.services.impl.DefaultResponseBuilder.render(DefaultResponseBuilder.java:187) > > * org.apache.tapestry.BaseComponent.renderComponent(BaseComponent.java:107) > > * org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:724) > > * > org.apache.tapestry.services.impl.DefaultResponseBuilder.render(DefaultResponseBuilder.java:187) > > * > org.apache.tapestry.AbstractComponent.renderBody(AbstractComponent.java:538) > > * org.apache.tapestry.html.Body.renderComponent(Body.java:38) > > > Andreas Andreou ha scritto: >> Hi, >> The error message says that something.getName() is trying to get evaluated >> but >> something is null >> >> Finding where exactly the error is thrown will show you which object is >> null... >> >> On Wed, Dec 30, 2009 at 20:51, Ivano Luberti <lube...@archicoop.it> wrote: >> >>> Hello, I'm trying to include some simple javascript in a component in my >>> T4 application. >>> I want my only textfield to get focus when is displayed. >>> I'm following the instructions provided at: >>> >>> http://tapestry.apache.org/tapestry4.1/components/general/script.html >>> >>> The template of the page including the component has @Shell and @Body >>> specified. >>> My component looks like this: >>> >>> <html> >>> <head> >>> <title>MET Online</title> >>> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> >>> <link href="css/stile_palmare.css" rel="stylesheet" type="text/css"> >>> </head> >>> <body> >>> <span jwcid="@Script" >>> script="/it/archimede/met/metgestioneingressi/tapestry/scripts/FormFocus.script" >>> component="ognl:components.barCode"/> >>> >>> <div id="box_operazione"> >>> <h1>Lettura BarCode</h1> >>> <br /> >>> <h2>passare il barcode sotto il lettore ottico</h2> >>> <form method="post" action="" jwcid="barCodeForm"> >>> <input type="text" jwcid="barCode" class="text_box" value="" /> >>> <br /><br /> >>> <input type="submit" name="Submit" value="Submit" class="bottone"> >>> </form> >>> </div> >>> >>> </body> >>> </html> >>> >>> The Script template file is the last one provides at: >>> >>> http://tapestry.apache.org/tapestry4.1/components/general/script.html >>> >>> the one without CDATA >>> >>> When I try to display the page I get: >>> >>> [ +/- ] Exception: Unable to read OGNL expression '<parsed OGNL >>> expression>' of >>> {component=$textfield_...@81eb97c1[homeloggeduser/barCodeForm.barCode]}: >>> source is null for getProperty(null, "name") >>> >>> I have already tried putting a bad component name in the @Script span >>> and the error changes, so it seem the name is right. I have put a bad >>> path to the script file and the error changes , then the path is correct. >>> >>> Can someone point me in the right direction? >>> >>> >>> >>> -- >>> ================================================== >>> dott. Ivano Mario Luberti >>> Archimede Informatica societa' cooperativa a r. l. >>> Sede Operativa >>> Via Gereschi 36 - 56126- Pisa >>> tel.: +39-050- 580959 >>> tel/fax: +39-050-9711344 >>> web: www.archicoop.it >>> ================================================== >>> >>> >>> --------------------------------------------------------------------- >>> To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org >>> For additional commands, e-mail: users-h...@tapestry.apache.org >>> >>> >>> >> >> >> >> > > -- > ================================================== > dott. Ivano Mario Luberti > Archimede Informatica societa' cooperativa a r. l. > Sede Operativa > Via Gereschi 36 - 56126- Pisa > tel.: +39-050- 580959 > tel/fax: +39-050-9711344 > web: www.archicoop.it > ================================================== > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org > For additional commands, e-mail: users-h...@tapestry.apache.org > > -- Andreas Andreou - andy...@apache.org - http://blog.andyhot.gr Tapestry / Tacos developer Open Source / JEE Consulting --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org For additional commands, e-mail: users-h...@tapestry.apache.org
