HTTP(S) vs Sockets/SecureSockets - Can I use HTTP(s)?

Good Day,
I'm writing client/server, currently using Sockets (actually Secure Sockets, but I don't think SSL actually enters into the overall question). In order to not worry about complaints from firewalls or proxies, it would seem easiest to instead be using HTTP(S) so we look just like a browser and web server.
However, it appears using the Java APIs you cannot avoid the open-request-response-close paradim, i.e. there is no way to keep the connection open (no persistence).
I can put "connection: keep-alive" in the mime header, but Java apparently forces me to close the input stream to send (i.e. POST) the client transmission, which closes the connection.
Is there a way (JDK 1.4) to keep an Http(s)UrlConnection open for continuous communication? The reason I care btw is because it is a heavily interactive data entry application, and response speed is crucial.
Or is it possible I am worrying about nothing because the overhead of opening/closing the Http(s)UrlConnection is minor? (I am assuimg the TCP/IP connection and the SSL session remain open regardless, and it is just the Java open/close UrlConnection overhead). I am thinking about how to test the various scenarios, but most of that is still ahead of me, and it's always useful to get other experienced comments.
Thanks in advance... Roger
p.s. I'm also worried that even if my client and my server think the connection is persistent, some proxy in the pipe might think otherwise. Is that an issue?

Have u got ur doubt cleared? lf no, l've a soln.
u cant retain the same urlconnection for many req-res pairs.
one conn is for one communication only. u cant keep the conn alive.
lt takes much time for first secure conn. lf it is in a loop, next subsequent conn takes very less
time. if u already know the no.of data to be sent, use a loop send the data with the same conn object.
--Rams

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Can i use the same socket to connect to more than one servers

hi,
I'm new to java. I want to know whether a socket created using Socket() constructor can be used to connect to multiple servers, not necessarily at a particular point of time. ie, i want to connect to various servers using a single socket and register some info abt them, possible using a loop, one by one. I use connect() method to connect to particular server.
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Edited by: itsraja on Feb 25, 2008 5:50 AM

In short, I don't think so.
Setting the server name for a socket is in the constructor.
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Dear Sir or Madam,
Since I am a TA for software architecture class, some one ask me the following question: I think the answer is "No" based on the document on http://java.sun.com/sfaq/
How I answer the quesions? Looking forward your help!!!
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 How can WLS use JSP pages in a Web Application (either a .war file or a war directory structure) without a java compiler?
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 On the development machine, when the server is requested to load the JSP it creates a tmpwar directory within the Web Application directory structure. This is then included in the resultant .war file thus:
 D:\war>jar -tf gmi.war
 META-INF/
 META-INF/MANIFEST.MF
 gmiService.jsp
 WEB-INF/
 WEB-INF/classes/
 WEB-INF/classes/com/
 WEB-INF/classes/com/bt/
 WEB-INF/classes/com/bt/gmi/
 WEB-INF/classes/com/bt/gmi/gmiService.class
 WEB-INF/getList.xsl
 WEB-INF/getListByConnection.xsl
 WEB-INF/getListByDistrict.xsl
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 WEB-INF/lib/
 WEB-INF/source/
 WEB-INF/source/build.bat
 WEB-INF/source/gmiService.java
 WEB-INF/web.xml
 WEB-INF/weblogic.xml
 tmpwar/
 tmpwar/jsp_servlet/
 tmpwar/jsp_servlet/_gmiservice.class
 tmpwar/jsp_servlet/_gmiservice.java
 When deployed on the production server with the web.xml file set to use the following values (note XML stripped):
 weblogic.jsp.pageCheckSeconds
 -1
 weblogic.jsp.precompile
 false
 weblogic.jsp.compileCommand
 javac
 weblogic.jsp.verbose
 true
 weblogic.jsp.packagePrefix
 jsp_servlet
 weblogic.jsp.keepgenerated
 false
 And in the weblogic.properties file:
 weblogic.httpd.webApp.gmi=war/gmi
 I've also tried with the .war file, but that insists on creating another tmpwar directory outside of the .war file.
 Then, although I have set pageCheckSeconds to -1 (don't check and don't recompile) ter production server still attempts to recompile the JSP's:
 Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp: init
 Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp: param verbose initialized to: true
 Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp: param packagePrefix initialized to: jsp_servlet
 Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp: param compileCommand initialized to: javac
 Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp: param srcCompiler initialized to weblogic.jspc
 Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp: param superclass initialized to null
 Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp: param workingDir initialized to: /opt/wls-servers/gmiServer/weblogic/war/gmi/_tmp_war
 Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp: param pageCheckSeconds initialized to: -1
 Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp: initialization complete
 Mon Sep 25 11:40:12 BST 2000: <WebAppServletContext-gmi> Generated java file: /opt/wls-servers/gmiServer/weblogic/war/gmi/_tmp_war/jsp_servlet/gmiService.java
 Mon Sep 25 11:40:14 BST 2000:<E> <WebAppServletContext-gmi> Compilation of /opt/wls-servers/gmiServer/weblogic/war/gmi/_tmp_war/jsp_servlet/gmiService.java failed: Exception in thread "main" java.lang.NoClassDefFoundError: sun/tools/javac/Main
 java.io.IOException: Compiler failed executable.exec([Ljava.lang.String;[javac, -classpath, /opt/Solaris_JRE_1.2.1_04/lib/rt.jar:/opt/Solaris_JRE_1.2.1_04/lib/i18n.jar:/opt/Solaris_JRE_1.2.1_04/classes:/var/wls/5.1/weblogic/lib/weblogic510sp4boot.jar:/var/wls/5.1/weblogic/classes/boot:/var/wls/5.1/weblogic/eval/cloudscape/lib/cloudscape.jar:/var/wls/5.1/weblogic/lib/wleorb.jar:/var/wls/5.1/weblogic/lib/wlepool.jar:/var/wls/5.1/weblogic/lib/weblogic510sp4.jar:/var/wls/5.1/weblogic/license:/var/wls/5.1/weblogic/classes:/var/wls/5.1/weblogic/lib/weblogicaux.jar:/opt/wls-servers/gmiServer/weblogic/gmiServer/serverclasses:/opt/wls-servers/gmiServer/weblogic/lotusxsl.jar:/opt/wls-servers/gmiServer/weblogic/xerces.jar:/opt/wls-servers/gmiServer/weblogic/logging.jar::/opt/wls-servers/gmiServer/weblogic/war/gmi/WEB-INF/classes:/opt/wls-servers/gmiServer/weblogic/war/gmi/_tmp_war, -d, /opt/wls-servers/gmiServer/weblogic/war/gmi/_tmp_war, /opt/wls-servers/gmiServer/weblogic/war/gmi/_tmp_war/jsp_servlet/gmiService.java])
 at java.lang.Throwable.fillInStackTrace(Native Method)
 at java.lang.Throwable.fillInStackTrace(Compiled Code)
 at java.lang.Throwable.<init>(Compiled Code)
 at java.lang.Exception.<init>(Compiled Code)
 at java.io.IOException.<init>(Compiled Code)
 at weblogic.utils.compiler.CompilerInvoker.compileMaybeExit(Compiled Code)
 at weblogic.utils.compiler.CompilerInvoker.compile(CompilerInvoker.java:200)
 at weblogic.servlet.jsp.JspStub.compilePage(Compiled Code)
 at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:173)
 at weblogic.servlet.internal.ServletStubImpl.getServlet(ServletStubImpl.java:187)
 at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:118)
 at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:142)
 at weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:744)
 at weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:692)
 at weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContextManager.java:251)
 at weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:363)
 at weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:263)
 at weblogic.kernel.ExecuteThread.run(Compiled Code)


The default Java compiler from sun lives in the tools.jar that comes with
 the JDK. Just add that to your set of JARs which are deployed in production
 and you should be fine. No need to install the full JDK - just make the
 tools.jar available to WebLogic.
 Regards
 James
 James Strachan
 =============
 email: [email protected]
 web: http://www.metastuff.com
 "Martin Webb" <[email protected]> wrote in message
 news:[email protected]...
 >
 > How can WLS use JSP pages in a Web Application (either a .war file or a
 war directory structure) without a java compiler?
 >
 > I suspect either the JSP specification is flawed (i.e. it doesn't take
 account of servers using just a JRE), or BEA's implementation is broken.
 >
 > Production servers do not have a JDK installed. They only have a JRE.
 Therfore a java compiler is not present on the machine that the Web
 Application is deployed onto.
 >
 > On the development machine, when the server is requested to load the JSP
 it creates a tmpwar directory within the Web Application directory
 structure. This is then included in the resultant .war file thus:
 >
 > D:\war>jar -tf gmi.war
 > META-INF/
 > META-INF/MANIFEST.MF
 > gmiService.jsp
 > WEB-INF/
 > WEB-INF/classes/
 > WEB-INF/classes/com/
 > WEB-INF/classes/com/bt/
 > WEB-INF/classes/com/bt/gmi/
 > WEB-INF/classes/com/bt/gmi/gmiService.class
 > WEB-INF/getList.xsl
 > WEB-INF/getListByConnection.xsl
 > WEB-INF/getListByDistrict.xsl
 > WEB-INF/getListByDistrictConnection.xsl
 > WEB-INF/lib/
 > WEB-INF/source/
 > WEB-INF/source/build.bat
 > WEB-INF/source/gmiService.java
 > WEB-INF/web.xml
 > WEB-INF/weblogic.xml
 > tmpwar/
 > tmpwar/jsp_servlet/
 > tmpwar/jsp_servlet/_gmiservice.class
 > tmpwar/jsp_servlet/_gmiservice.java
 >
 > When deployed on the production server with the web.xml file set to use
 the following values (note XML stripped):
 >
 > weblogic.jsp.pageCheckSeconds
 > -1
 >
 > weblogic.jsp.precompile
 > false
 >
 > weblogic.jsp.compileCommand
 > javac
 >
 > weblogic.jsp.verbose
 > true
 >
 > weblogic.jsp.packagePrefix
 > jsp_servlet
 >
 > weblogic.jsp.keepgenerated
 > false
 >
 >
 > And in the weblogic.properties file:
 >
 > weblogic.httpd.webApp.gmi=war/gmi
 >
 > I've also tried with the .war file, but that insists on creating another
 tmpwar directory outside of the .war file.
 >
 >
 > Then, although I have set pageCheckSeconds to -1 (don't check and don't
 recompile) ter production server still attempts to recompile the JSP's:
 >
 >
 > Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp: init
 > Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp: param
 verbose initialized to: true
 > Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp: param
 packagePrefix initialized to: jsp_servlet
 > Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp: param
 compileCommand initialized to: javac
 > Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp: param
 srcCompiler initialized to weblogic.jspc
 > Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp: param
 superclass initialized to null
 > Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp: param
 workingDir initialized to:
 /opt/wls-servers/gmiServer/weblogic/war/gmi/_tmp_war
 > Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp: param
 pageCheckSeconds initialized to: -1
 > Mon Sep 25 11:40:11 BST 2000: <WebAppServletContext-gmi> *.jsp:
 initialization complete
 > Mon Sep 25 11:40:12 BST 2000: <WebAppServletContext-gmi> Generated java
 file:
 /opt/wls-servers/gmiServer/weblogic/war/gmi/_tmp_war/jsp_servlet/gmiService.
 java
 > Mon Sep 25 11:40:14 BST 2000:<E> <WebAppServletContext-gmi> Compilation of
 /opt/wls-servers/gmiServer/weblogic/war/gmi/_tmp_war/jsp_servlet/gmiService.
 java failed: Exception in thread "main" java.lang.NoClassDefFoundError:
 sun/tools/javac/Main
 >
 > java.io.IOException: Compiler failed
 executable.exec([Ljava.lang.String;[javac, -classpath,
 /opt/Solaris_JRE_1.2.1_04/lib/rt.jar:/opt/Solaris_JRE_1.2.1_04/lib/i18n.jar:
 /opt/Solaris_JRE_1.2.1_04/classes:/var/wls/5.1/weblogic/lib/weblogic510sp4bo
 ot.jar:/var/wls/5.1/weblogic/classes/boot:/var/wls/5.1/weblogic/eval/cloudsc
 ape/lib/cloudscape.jar:/var/wls/5.1/weblogic/lib/wleorb.jar:/var/wls/5.1/web
 logic/lib/wlepool.jar:/var/wls/5.1/weblogic/lib/weblogic510sp4.jar:/var/wls/
 5.1/weblogic/license:/var/wls/5.1/weblogic/classes:/var/wls/5.1/weblogic/lib
 /weblogicaux.jar:/opt/wls-servers/gmiServer/weblogic/gmiServer/serverclasses
 :/opt/wls-servers/gmiServer/weblogic/lotusxsl.jar:/opt/wls-servers/gmiServer
 /weblogic/xerces.jar:/opt/wls-servers/gmiServer/weblogic/logging.jar::/opt/w
 ls-servers/gmiServer/weblogic/war/gmi/WEB-INF/classes:/opt/wls-servers/gmiSe
 rver/weblogic/war/gmi/_tmp_war, -d,
 /opt/wls-servers/gmiServer/weblogic/war/gmi/_tmp_war,
 /opt/wls-servers/gmiServer/weblogic/war/gmi/_tmp_war/jsp_servlet/gmiService.
 java])
 > at java.lang.Throwable.fillInStackTrace(Native Method)
 > at java.lang.Throwable.fillInStackTrace(Compiled Code)
 > at java.lang.Throwable.<init>(Compiled Code)
 > at java.lang.Exception.<init>(Compiled Code)
 > at java.io.IOException.<init>(Compiled Code)
 > at
 weblogic.utils.compiler.CompilerInvoker.compileMaybeExit(Compiled Code)
 > at
 weblogic.utils.compiler.CompilerInvoker.compile(CompilerInvoker.java:200)
 > at weblogic.servlet.jsp.JspStub.compilePage(Compiled Code)
 > at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:173)
 > at
 weblogic.servlet.internal.ServletStubImpl.getServlet(ServletStubImpl.java:18
 7)
 > at
 weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
 :118)
 > at
 weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
 :142)
 > at
 weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
 l.java:744)
 > at
 weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
 l.java:692)
 > at
 weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContext
 Manager.java:251)
 > at
 weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:363)
 > at
 weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:263)
 > at weblogic.kernel.ExecuteThread.run(Compiled Code)
 >
 >
 >

How can i Use SERVLET with RMI to avoid trust certificate

I know that for begining RMI, you must launch the server and the client.
for the server i use :
java -Djavax.net.ssl.trustStore=server.keystore -Djavax.net.ssl.keyStore=server.keystore -Djavax.net.ssl.keyStorePassword=server TestServer
for the client I use :
java -Djavax.net.ssl.trustStore=client.keystore -Djavax.net.ssl.keyStore=client.keystore -Djavax.net.ssl.keyStorePassword=client TestClient
and all work fine.
but i want to use a servlet for rmi client and i wrote this:
public class AppelServlet extends HttpServlet
 public void doPost(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException
 try
 System.out.println("Registering secure RMI socket factory ...");
 java.rmi.server.RMISocketFactory.setSocketFactory(new SecureRMISocketFactory());
 TestRemote test = (TestRemote) Naming.lookup("rmi://127.0.0.1:7123/TestClient");
String reponse=test.toLowerCase("HELLO WORLD");
 System.out.println("la reponse est : "+reponse);
 catch (Exception e)
 System.out.println("test client exception: " +e);
PrintWriter out = response.getWriter();
 response.setContentType("text/html");
and i have the following error on tomcat:
Registering secure RMI socket factory ...
test client exception: java.rmi.ConnectIOException: error during JRMP connection
establishment; nested exception is:
javax.net.ssl.SSLHandshakeException: Couldn't find trusted certificate
i think i must precise how to indicate the truststore like in the first case.
help me please.
hamdi

Hi,
Try doing the following steps.
Assuming you have a certificate obtained
Export the certificate into a .cer file.
On IE, goto tools->internet options->content->certificates, and export to a .cer file.
Using keytool of java import the certificate to the store that can be used doing the following command.
keytool -import -alias <ailas> -file < .cer filename> -keystore <storename here>
set the javax.net.ssl.trustStore and javax.net.ssl.trustStorePassword properties at the command prompt using the command below.
java -Djavax.net.ssl.trustStore=<storename> -Djavax.net.ssl.trustStorePassword=<password> <classname>
Let me know if this helped.
Also take a look at this link for using RMI with SSL
http://java.sun.com/products/jdk/1.2/docs/guide/rmi/SSLInfo.html
Regards,
Roopasri Vittal
Developer Technical Support
Sun Microsystems
http://sun.com/developers/support

How to make a java program, that can be used by c++ application

I'm developing a Java web application (WEBapp), but I have also a c++ program.
C++ program must use WEBapp method to communicate on the web.
How to make a Java public function that accept value, elaborate, then return the resul to c++ application?

jschell wrote:
You have C code.
You have Java code.
The two must communicate.I have a c++ program, and a Java program.
C++ program wants to communicate on the web (send text), and I'm trying to add this functionality to it creating a Java program.
NOW THE PROBLEM? How c++ program can use java-program (in local) to send data on the web?
You can just JNI to communicate either from java to C++ or from C++ to java. That is direct communication in that there is a single process involved. Thus you will no longer have a java application and a C++ application but rather a single application.I don't know JNI, i found http://java.sun.com/docs/books/jni/ and I think is too difficult to implement?
You can use files or sockets to communicate. Using sockets allows for any number of additional protocols including the previously mentioned web services. Those methodologies would allow more than one application to exist.I developed yesterday a java-side-interface using socket (in local host 127.0.0.1). So the c++ program must write or read to/from the socket to comunicate to java (then the java program send data on the web).
Finally it might be the case that you have a C++ application which you cannot modify. In that case then you MUST use whatever input/output mechanism that it supports. There is no choice. And until you have fully determined what those mechanisms are it is pointless to discuss a solution.I can modify the application, but I don't have developed it. The c++ application use a third-part dll (taken from SKYPE) to comunicate on the web: I have to remove the dipendence from this dll, and add the java program: java program must substitute the dll. It must be non-invasive to the c++ program. DLL calls can be "send(data)" or "receive(data)" or similar.
For this do you think that JNI is a must, or I can use soket on local host?

Can I use my ipad 2 in Australia and New Zealand without a power converter to 110 volts?

Can I use my ipad 2 in Australia and New Zealand without a power converter to 110 volts?

As noted your power adapter will handle the voltage. You might however need a plug adapter if those county's use a different physical arrangement...
http://www.worldstandards.eu/electricity/plugs-and-sockets/
http://www.kropla.com/electric2.htm

How can I use SSL in httpunit??

How can I use SSL in httpunit? I am using HTTPUNIT 1.5.4 and the
j2sdk1.4.1_04?
I want to activate a submit button that following an https-Url in the
html action method...
The SSL certificateis from Server,
i want to connect, is comming from Thawte. then it should be automatically
trusted by the "trust file" within the JVM (FAQ) but it does not. Can me
someone explain what to do?
Here is the throwing Exception:
java.net.SocketException: Network is unreachable: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
at java.net.Socket.connect(Socket.java:434)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(DashoA6275)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.<init>(DashoA6275)
at
com.sun.net.ssl.internal.ssl.SSLSocketFactoryImpl.createSocket(DashoA6275)
at sun.net.www.protocol.https.HttpsClient.doConnect(DashoA6275)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:386)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:602)
at sun.net.www.protocol.https.HttpsClient.<init>(DashoA6275)
at sun.net.www.protocol.https.HttpsClient.a(DashoA6275)
at sun.net.www.protocol.https.HttpsClient.a(DashoA6275)
at sun.net.www.protocol.https.HttpsClient.a(DashoA6275)
at
sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.plainConnect(DashoA6275)
at
sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(DashoA6275)
at
sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:528)
at
com.sun.net.ssl.internal.www.protocol.https.HttpsURLConnectionOldImpl.getOutputStream(DashoA6275)
at
com.meterware.httpunit.MessageBodyWebRequest.completeRequest(MessageBodyWebRequest.java:96)
at
com.meterware.httpunit.WebConversation.newResponse(WebConversation.java:60)
at com.meterware.httpunit.WebWindow.getResource(WebWindow.java:162)
at com.meterware.httpunit.WebWindow.getSubframeResponse(WebWindow.java:125)
at com.meterware.httpunit.WebWindow.getResponse(WebWindow.java:118)
at com.meterware.httpunit.WebWindow.sendRequest(WebWindow.java:107)
at
com.meterware.httpunit.WebRequestSource.submitRequest(WebRequestSource.java:245)
at
com.meterware.httpunit.WebRequestSource.submitRequest(WebRequestSource.java:224)
at com.meterware.httpunit.WebForm.doFormSubmit(WebForm.java:75)
at com.meterware.httpunit.WebForm.submit(WebForm.java:67)
best regards,
Frank

Umm...not to be (too) rude - but did you try reading the error message?
"java.net.SocketException: Network is unreachable: connect"
You haven't gotten to the "is my certificate acceptable" part yet, because you aren't even getting off of your box.
Grant

HTTP(S) vs Sockets/SecureSockets - Can I use HTTP(s)?

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