develop Ext project problem

[Scarletake Bwi，修改在3 年前。]

Hello, everybody

I use liferay 6.1.1, windows 7 and MySQL 5.5,
I can developed portlet project, no problem.
But whenever I develop Ext project, the server will be damaged, I can only delete the folder "data" and "tomcat", then restore the database again, and, all over again.

I would like to ask the following question.
First, where can i find "Ext" or "Hook" sample project for study. I bought "Liferay in Action" e-book, but examples it provided cannot run on 6.1.1.
Second, how to avoid this problem, and don't need to reset (totally) my develop environment.

thank you.

the exception message:
21:58:17,870 ERROR [http-bio-8080-exec-3][MainServlet:426] com.liferay.portal.NoSuchLayoutException: No Layout exists with the primary key 10588
com.liferay.portal.NoSuchLayoutException: No Layout exists with the primary key 10588
at com.liferay.portal.service.persistence.LayoutPersistenceImpl.findByPrimaryKey(LayoutPersistenceImpl.java:943)
at com.liferay.portal.service.base.LayoutLocalServiceBaseImpl.getLayout(LayoutLocalServiceBaseImpl.java:401)
at sun.reflect.GeneratedMethodAccessor202.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:122)
at com.liferay.portal.service.impl.LayoutLocalServiceVirtualLayoutsAdvice.invoke(LayoutLocalServiceVirtualLayoutsAdvice.java:76)
at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:118)
at com.liferay.portal.service.impl.LayoutLocalServiceStagingAdvice.invoke(LayoutLocalServiceStagingAdvice.java:107)
at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:118)
at com.liferay.portal.spring.transaction.TransactionInterceptor.invoke(TransactionInterceptor.java:71)
at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:118)
at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:57)
at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:118)
at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:57)
at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:118)
at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:57)
at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:118)
at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:57)
at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:118)
at com.liferay.portal.spring.aop.ServiceBeanAopProxy.invoke(ServiceBeanAopProxy.java:211)
at $Proxy27.getLayout(Unknown Source)
at com.liferay.portal.service.LayoutLocalServiceUtil.getLayout(LayoutLocalServiceUtil.java:181)
at com.liferay.portal.servlet.MainServlet.processGroupInactiveRequest(MainServlet.java:1122)
at com.liferay.portal.servlet.MainServlet.service(MainServlet.java:417)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:72)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
at com.liferay.portal.servlet.filters.strip.StripFilter.processFilter(StripFilter.java:335)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
at com.liferay.portal.servlet.filters.gzip.GZipFilter.processFilter(GZipFilter.java:123)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
at com.liferay.portal.servlet.filters.secure.SecureFilter.processFilter(SecureFilter.java:294)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
at com.liferay.portal.servlet.filters.autologin.AutoLoginFilter.processFilter(AutoLoginFilter.java:246)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
at com.liferay.portal.servlet.filters.sso.ntlm.NtlmPostFilter.processFilter(NtlmPostFilter.java:83)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
at com.liferay.portal.sharepoint.SharepointFilter.processFilter(SharepointFilter.java:80)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:187)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:95)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:738)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:167)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:95)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:167)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:95)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:187)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:95)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:73)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

[dave ch，修改在11 年前。]

Hi scarletake,

Use a hook and you should generally avoid using an ext-plugin unless you have no other choices.
For your issue, seems to be like you probably have something not configured correctly .
For Hook example Check out https://github.com/liferay/liferay-plugins/tree/6.1.x/portlets/test-hook-portlet

Hope that helps you.

Regards

Dave

[Hitoshi Ozawa，修改在11 年前。]

You're probably trying to develop an ext plugin. You can't deploy 2 ext plugin on to a liferay portal so you need to reset liferay back to the state you had before you deployed it.
You also need to re-start liferay every time you deploy an ext plugin to make changes effective. These are just limitation of ext plugin.

With hooks, however, don't have these limitations but you can't overwrite impl java classes.

[Nicolas Tamayo，修改在11 年前。]

Hi both.

the limitation with the hook may be avoid with PortalClassInvoker to done call to impl Class, because the best practice is extend not override

regards

[Hitoshi Ozawa，修改在11 年前。]

the limitation with the hook may be avoid with PortalClassInvoker to done call to impl Class,

Yes, you can call Impl methods from your hook but extending a class won't change liferay's methods.
What liferay actually does is it allows admin to specify which class to call in portal-ext.properties.

[Scarletake Bwi，修改在3 年前。]

Hitoshi Ozawa:

You can't deploy 2 ext plugin on to a liferay portal so you need to reset liferay back to the state you had before you deployed it.
You also need to re-start liferay every time you deploy an ext plugin to make changes effective. These are just limitation of ext plugin.

With hooks, however, don't have these limitations but you can't overwrite impl java classes.

first of all, thank you, all of you, for your reply.

i will try the example.

now i have a new questions
1. is there liferay only can have one ext plugin project?
2. before i start the server at the first time(basic config), i added a file name "portal-ext.properties" under folder "C:\liferay-portal-6.1.1-ce-ga2\tomcat-7.0.27\webapps\ROOT\WEB-INF\classes" to switch db to my MySql, is that the reason my exception occurs?

about my step.
1. i create a liferay project, and select "Ext".
2. i create everything under "ext-web", just like an independent portlet.

again, thank you, thank you very much.

[Manish Yadav，修改在11 年前。]

Could you provide steps how you are creating ext plugin.Because while creating ext-pluing generally it not showing error..Error can come while deploying..and can you provide also detials you are going to write in ext-pluing