JavaScript and Java Communication

Hello

I'm building application using the ADF with Jdeveloper 11.1.2.3 as IDE technology. In the application in a jspx page, I have the < OBJECT > tag where the user can insert a special entry type (digital signature). These tag data are accessible in the page jspx through Javascript function. The problem is: How can I access the variables that define the function Javascript (which contain the digital signature data) through the Java BackingBeanclass(NO Servlet).

He comes to the < OBJECT > tag and buttons that call the function Javascript :

Note: I'm sure that Javascript hold the necessary data (digital signature object) and not all the functions I have.

<OBJECT classid="clsid:69A40DA3-4D42-11D0-86B0-0000C025864A" height="75" border="2" id="SigPlus1"
                        name="SigPlus1" style="HEIGHT: 180px; WIDTH: 320px; LEFT: 0px; TOP: 0px;">
                  <param name="_Version" value="131095"/>
                  <param name="_ExtentX" value="4842"/>
                  <param name="_ExtentY" value="1323"/>
                  <param name="_StockProps" value="0"/>
                </OBJECT>
              
                                <INPUT id="submit1" name="Save" type="submit" value="Save" onclick="OnSave()"/>

I tried the following approach, but it does not work:

I've added a hidden filed in the page as and bind the value property of the entrance hidden from an attribute in the BackingBean java as follows:

<input type="hidden" id="passSignToBean" value="${SRdetailsBean.sigObj}"/>

and it's the Javascript function that will change the entry filed the value:

function OnSave() {


document.forms[0].SigPlus1.TabletState = 0; //Turns tablet off
document.forms[0].SigPlus1.SigCompressionMode = 2; //Compresses the signature at a 2.5 to 1 ratio, making it smaller...to display the signature again later, you WILL HAVE TO set the SigCompressionMode of the new SigPlus object = 1, also


alert("Test 1");


document.getElementById('passSignToBean').value = document.forms[0].SigPlus1;


alert("Test 2");
}

My idea is that when the user click on submit button Javascript OnSave() function will be called and change the value of the hidden input tag. Since, I lie this entry filed with an attribute in the BacknigBean java (I guess) the attribute in the bean must be updated to match the new value of the hidden entry filed.

Important note:

I don't use HttpServlet.

I do not use java appland.

When I am trying this approach this error occur when I try to use the attribute BackingBean of java. It is show NullPointerException:

< RichExceptionHandler > < _logUnhandledException > ADF_FACES - 60098:Faces life cycle receives exceptions that are unhandled in phase 5 of INVOKE_APPLICATION

javax.faces.el.EvaluationException: java.lang.NullPointerException

at org.apache.myfaces.trinidadinternal.taglib.util.MethodExpressionMethodBinding.invoke(MethodExpressionMethodBinding.java:58)

at org.apache.myfaces.trinidad.component.UIXComponentBase.broadcastToMethodBinding(UIXComponentBase.java:1545)

at org.apache.myfaces.trinidad.component.UIXCommand.broadcast(UIXCommand.java:183)

at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:787)

at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1252)

at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._invokeApplication(LifecycleImpl.java:973)

at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:354)

at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:202)

at javax.faces.webapp.FacesServlet.service(FacesServlet.java:508)

to weblogic.servlet.internal.StubSecurityHelper$ ServletServiceAction.run (StubSecurityHelper.java:227)

at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)

at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)

at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)

at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)

at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:173)

at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)

at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:125)

to org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$ FilterListChain.doFilter (TrinidadFilterImpl.java:468)

at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)

to org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$ FilterListChain.doFilter (TrinidadFilterImpl.java:468)

at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:293)

at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:199)

at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)

at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)

to oracle.security.jps.ee.http.JpsAbsFilter$ 1.run(JpsAbsFilter.java:119)

at java.security.AccessController.doPrivileged (Native Method)

at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:315)

at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:442)

at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:103)

at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:171)

at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)

at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)

at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:139)

at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)

at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)

at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)

to weblogic.servlet.internal.WebAppServletContext$ ServletInvocationAction.wrapRun (WebAppServletContext.java:3715)

to weblogic.servlet.internal.WebAppServletContext$ ServletInvocationAction.run (WebAppServletContext.java:3681)

at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)

at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)

at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)

at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)

at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)

at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)

at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)

Caused by: java.lang.NullPointerException

to the view. SRdetailsBean.CheckSignatureAvailabilty (SRdetailsBean.java:978)

at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at com.sun.el.parser.AstValue.invoke (unknown Source)

at com.sun.el.MethodExpressionImpl.invoke (unknown Source)

at org.apache.myfaces.trinidadinternal.taglib.util.MethodExpressionMethodBinding.invoke(MethodExpressionMethodBinding.java:53)

... more than 44

< 9 December 2013 09:21:48 AST > < error > < HTTP > < BEA-101017 > < [ServletContext@6388354[app:SR_Application module: root SR_Application-ViewController-context-path: / SR_Application-ViewController-context-root spec-version: 2.5], request: [weblogic.servlet.internal.ServletRequestImpl@c2e7ce

POST /SR_Application-ViewController-context-root/faces/SR_Dtalis-task-flow/SRdetalis?_adf.ctrl-state=lc7xf1usx_9 HTTP/1.1

Accept: text/html, application/xhtml + xml, * / *.

Referer: :7101/SR_Application-ViewController-context-root/faces/SR_Dtalis-Task-Flow/SRdetalis?_adf.Ctrl-State=lc7xf1usx_9 http://127.0.0.1

Accept-Language: en-US, en; q = 0.8, ar - KW; q = 0.5, ar; q = 0.3

User-Agent: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)

Content-Type: multipart/form-data; Boundary = - 7dd24f3010422

Accept-Encoding: gzip, deflate

Content-Length: 1833

DNT: 1

Connection: Keep-Alive

Cache-Control: no cache

Cookie: JSESSIONID = QQnmSlhSJ1hVgLn5JhNnhJJHtTZvnnFkQkh6zRmdLYrN2VcwQD38! 1317613197

Root cause]] of ServletException.

java.lang.NullPointerException

to the view. SRdetailsBean.CheckSignatureAvailabilty (SRdetailsBean.java:978)

at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

Truncated. check the log file full stacktrace

< 9 December 2013 09:21:48 AST > < opinion > < Diagnostics > < BEA-320068 > < Watch "UncheckedException" with severity "Notice" on the server "DefaultServer" released on December 9, 2013 09:21:48 AST. Details of the notification:

WatchRuleType: Journal

WatchRule: (SEVERITY = "Error") AND ((MSGID = ' WL-101020') OR (MSGID = "WL-101017'") OR (MSGID = "WL-000802'") OR (MSGID = "BEA-101020'") OR (MSGID = "BEA-101017'") OR (MSGID = "BEA-000802'"))

WatchData: DATE = December 9, 2013 09:21:48 AST SERVER = DefaultServer MESSAGE = [ServletContext@6388354[app:SR_Application module: root SR_Application-ViewController-context-path: / SR_Application-ViewController-context-root spec-version: 2.5], request: [weblogic.servlet.internal.ServletRequestImpl@c2e7ce