Abstract:
A method in a data processing system for selecting a Java virtual machine for use with a browser. A user is prompted for an input, wherein input identifies a virtual machine to be used with the browser. A profile is altered for the browser to include an identification of the virtual machine identified by the input. The profile is used to select a virtual machine for use with the browser.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present invention is related to the following applications entitled “Method and Apparatus for Selectively and Dynamically Selecting Classes in a Data Processing System”, Ser. No. 09/127,336, filed even date hereof, assigned to a common assignee, and “Method and Apparatus to Selectively Define Java Virtual Machine Initializing Properties Using a Browser Graphical User Interface”, Ser. No. 09/127,337, filed even date hereof, are incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     1. Technical Field 
     The present invention relates generally to an improved data processing system, and in particular to a method and apparatus for selecting an application. Still more particularly, the present invention relates to a method and apparatus for selecting a Java virtual machine for use with a browser program. 
     2. Description of Related Art 
     Internet, also referred to as an “internetwork”, in communications is a set of computer networks, possibly dissimilar, joined-together by means of gateways that handle data transfer and the conversion of messages from the sending network to the protocols used by the receiving network (with packets if necessary). When capitalized, the term “Internet” refers to the collection of networks and gateways that use the TCP/IP suite of protocols. 
     The Internet has become a cultural fixture as a source of both information and entertainment. Many businesses are creating Internet sites as an integral part of their marketing efforts, informing consumers of the products or services offered by the business or providing other information seeking to engender brand loyalty. Many federal, state, and local government agencies are also employing Internet sites for informational purposes, particularly agencies which must interact with virtually all segments of society such as the Internal Revenue Service and secretaries of state. Operating costs may be reduced by providing informational guides and/or searchable databases of public records online. 
     Currently, the most commonly employed method of transferring data over the Internet is to employ the World Wide Web environment, also called simply “the web”. Other Internet resources exist for transferring information, such as File Transfer Protocol (FTP) and Gopher, but have not achieved the popularity of the web. In the web environment, servers and clients effect data transaction using the Hypertext Transfer Protocol (HTTP), a known protocol for handling the transfer of various data files (e.g., text, still graphic images, audio, motion video, etc.). Information is formatted for presentation to a user by a standard page description language, the Hypertext Markup Language (HTML). In addition to basic presentation formatting, HTML allows developers to specify “links” to other web resources identified by a Uniform Resource Locator (URL). A URL is a special syntax identifier defining a communications path to specific information. Each logical block of information accessible to a client, called a “page” or a “web page”, is identified by a URL. The URL provides a universal, consistent method for finding and accessing this information by the web “browser”. A browser is a program capable of submitting a request for information identified by a URL at the client machine. Retrieval of information on the web is generally accomplished with an HTML-compatible browser. 
     When a user desires to retrieve a page, a request is submitted to a server connected to a client computer at which the user is located and may be handled by a series of servers to effect retrieval of the requested information. The information is provided to the client formatted according to HTML. Typically, personal computers (PCs) along with work stations are typically used to access the Internet. 
     Often applications or programs may be sent to a computer from a web server across the Internet. Java applications are becoming increasingly more prevalent as the type of application sent between web servers and client computers. Java applications are common on the Internet and becoming more increasingly common in intranets and in other types of networks used in businesses. 
     Java is an object oriented programming language and environment focusing on defining data as objects and the methods that may be applied to those objects. Java supports only a single inheritance, meaning that each class can inherit from only one other class at any given time. Java also allows for the creation of totally abstract classes known as interfaces, which allow the defining of methods that may be shared with several classes without regard for how other classes are handling the methods. 
     The Java virtual machine (JVM) is a virtual computer component that resides only in memory. The JVM allows Java programs to be executed on a different platform as opposed to only the one platform for which the code was compiled. Java programs are compiled for the JVM. In this manner, Java is able to support applications for many types of data processing systems, which may contain a variety of central processing units and operating systems architectures. To enable a Java application to execute on different types of data processing systems, a compiler typically generates an architecture-neutral file format—the compiled code is executable on many processors, given the presence of the Java run-time system. The Java compiler generates bytecode instructions that are non-specific to a particular computer architecture. A bytecode is a machine independent code generated by the Java compiler and executed by a Java interpreter. A Java interpreter is a part in the JVM that alternately decodes and interprets a bytecode or bytecodes. These bytecode instructions are designed to be easy to interpret on any computer and easily translated on the fly into native machine code. 
     Many currently available web browsers, such as Netscape Communicator, which is available from Netscape Communications Corporation, incorporate JVMs as part of the web browser. Presently, however, JVMs updates are provided more often than web browser updates. Such a situation prevents users from taking advantage of improved versions of JVMs until the web browser is updated. Another problem that occurs is that some applications will function better with earlier versions of a JVM opposed to a newer version released with a newer version of a browser. Therefore, it would be advantageous to have an improved method and apparatus for providing users an ability to use more recent versions of JVMs without having to wait for an updated version of the web browser. 
     SUMMARY OF THE INVENTION 
     The present invention provides a method in a data processing system for selecting a Java virtual machine for use with a browser. A user is prompted for an input, wherein input identifies a virtual machine to be used with the browser. A profile is altered for the browser to include an identification of the virtual machine identified by the input. The profile is used to select a virtual machine for use with the browser. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The novel features believed characteristic of the invention are set forth in the appended claims. The invention itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying drawings, wherein: 
     FIG. 1 is a pictorial representation of a distributed data processing system in which the present invention may be implemented; 
     FIG. 2 is a block diagram of a data processing system which may be implemented as a server in accordance to the present invention; 
     FIG. 3 is a block diagram of a data processing system in which the present invention may be implemented; 
     FIG. 4 is a block diagram of components used to select a Java virtual machine for use with a browser in accordance with a preferred embodiment of the present invention; 
     FIGS. 5A-5C are graphical user interfaces employed to select a Java virtual machine in accordance with a preferred embodiment of the present invention; 
     FIG. 6 is a diagram of a user profile data structure managed by a user profile manager in accordance with a preferred embodiment of the present invention; 
     FIG. 7 is a high level flowchart of a process used to select a JVM for use with a web browser in accordance with a preferred embodiment of the present invention; 
     FIG. 8 is a flowchart of a process used to select a JVM in accordance with a preferred embodiment of the present invention; and 
     FIG. 9 is a flowchart of a process for starting a JVM by the browser in accordance with a preferred embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     With reference now to the figures, and in particular with reference to FIG. 1, a pictorial representation of a distributed data processing system in which the present invention may be implemented is depicted. 
     Distributed data processing system  100  is a network of computers in which the present invention may be implemented. Distributed data processing system  100  contains a network  102 , which is the medium used to provide communications links between various devices and computers connected together within distributed data processing system  100 . Network  102  may include permanent connections, such as wire or fiber optic cables, or temporary connections made through telephone connections. 
     In the depicted example, a server  104  is connected to network  102  along with storage unit  106 . In addition, clients  108 ,  110 , and  112  also are connected to a network  102 . These clients  108 ,  110 , and  112  may be, for example, personal computers or network computers. For purposes of this application, a network computer is any computer, coupled to a network, which receives a program or other application from another computer coupled to the network. In the depicted example, server  104  provides data, such as boot files, operating system images, and applications to clients  108 - 112 . Clients  108 ,  110 , and  112  are clients to server  104 . Distributed data processing system  100  may include additional servers, clients, and other devices not shown. In the depicted example, distributed data processing system  100  is the Internet with network  102  representing a worldwide collection of networks and gateways that use the TCP/IP suite of protocols to communicate with one another. At the heart of the Internet is a backbone of high-speed data communication lines between major nodes or host computers, consisting of thousands of commercial, government, educational, and other computer systems, that route data and messages. Of course, distributed data processing system  100  also may be implemented as an umber of different types of networks, such as for example, an intranet or a local area network. 
     FIG. 1 is intended as an example, and not as an architectural limitation for the processes of the present invention. 
     Referring to FIG. 2, a block diagram of a data processing system which may be implemented as a server, such as server  104  in FIG. 1, is depicted in accordance to the present invention. Data processing system  200  may be a symmetric multiprocessor (SMP) system including a plurality of processors  202  and  204  connected to system bus  206 . Alternatively, a single processor system may be employed. Also connected to system bus  206  is memory controller/cache  208 , which provides an interface to local memory  209 . I/O bus bridge  210  is connected to system bus  206  and provides an interface to I/O bus  212 . Memory controller/cache  208  and I/O bus bridge  210  may be integrated as depicted. 
     Peripheral component interconnect (PCI) bus bridge  214  connected to I/O bus  212  provides an interface to PCI local bus  216 . A number of modems  218 - 220  may be connected to PCI bus  216 . Typical PCI bus implementations will support four PCI expansion slots or add-in connectors. Communications links to network computers  108 - 112  in FIG. 1 may be provided through modem  218  and network adapter  220  connected to PCI local bus  216  through add-in boards. 
     Additional PCI bus bridges  222  and  224  provide interfaces for additional PCI buses  226  and  228 , from which additional modems or network adapters may be supported. In this manner, server  200  allows connections to multiple network computers. A memory mapped graphics adapter  230  and hard disk  232  may also be connected to I/O bus  212  as depicted, either directly or indirectly. 
     Those of ordinary skill in the art will appreciate that the hardware depicted in FIG. 2 may vary. For example, other peripheral devices, such as optical disk drive and the like also may be used in addition or in place of the hardware depicted. The depicted example is not meant to imply architectural limitations with respect to the present invention. 
     The data processing system depicted in FIG. 2 may be, for example, an IBM RISC/System 6000 system, a product of International Business Machines Corporation in Armonk, N.Y., running the Advanced Interactive Executive (AIX) operating system. 
     With reference now to FIG. 3, a block diagram of a data processing system in which the present invention may be implemented is illustrated. Data processing system  300  is an example of a client computer. Data processing system  300  employs a peripheral component interconnect (PCI) local bus architecture. Although the depicted example employs a PCI bus, other bus architectures such as Micro Channel and ISA may be used. Processor  302  and main memory  304  are connected to PCI local bus  306  through PCI bridge  308 . PCI bridge  308  also may include an integrated memory controller and cache memory for processor  302 . Additional connections to PCI local bus  306  may be made through direct component interconnection or through add-in boards. In the depicted example, local area network (LAN) adapter  310 , SCSI host bus adapter  312 , and expansion bus interface  314  are connected to PCI local bus  306  by direct component connection. In contrast, audio adapter  316 , graphics adapter  318 , and audio/video adapter (A/V)  319  are connected to PCI local bus  306  by add-in boards inserted into expansion slots. Expansion bus interface  314  provides a connection for a keyboard and mouse adapter  320 , modem  322 , and additional memory  324 . SCSI host bus adapter  312  provides a connection for hard disk drive  326 , tape drive  328 , and CD-ROM  330  in the depicted example. Typical PCI local bus implementations will support three or four PCI expansion slots or add-in connectors. 
     An operating system runs on processor  302  and is used to coordinate and provide control of various components within data processing system  300  in FIG.  1 . The operating system may be a commercially available operating system such as OS/2, which is available from International Business Machines Corporation. “OS/2” is a trademark of from International Business Machines Corporation. An object oriented programming system such as Java may run in conjunction with the operating system and provides calls to the operating system from Java programs or applications executing on data processing system  300 . Instructions for the operating system, the object-oriented operating system, and applications or programs are located on storage devices, such as hard disk drive  326  and may be loaded into main memory  304  for execution by processor  302 . 
     Those of ordinary skill in the art will appreciate that the hardware in FIG. 3 may vary depending on the implementation. For example, other peripheral devices, such as optical disk drives and the like may be used in addition to or in place of the hardware depicted in FIG.  3 . The depicted example is not meant to imply architectural limitations with respect to the present invention. For example, the processes of the present invention may be applied to multiprocessor data processing system. 
     The present invention provides a method, apparatus, and instructions for selecting a virtual machine for use with an application and in particular for use with a browser in the depicted examples. The present invention provides a graphical user interface (GUI) associated with the web browser that allows a user to specify which Java virtual machine will be used by the browser. This mechanism is used in supporting decoupling the browser from a fixed Java environment, which allows for using releases of Java virtual machines independently from releases of browsers. In addition, the present invention provides for allowing for different Java virtual machines to be selected for different profiles when multiple user profiles are present for the browser. As used herein, the term “browser” refers to browsers in addition to hypertext markup language (HTML) browsers, such as Netscape Communicator for OS/2. In addition, a browser may encompass other applications that navigate in a Java based network. 
     In the depicted examples, the processes and interfaces described are for a browser, such as Netscape Communicator operating in an OS/2 operating system. These examples are not intended to limit the invention to a particular browser or operating system. The processes and interfaces of the present invention may be applied to other types of browsers and operating systems. 
     With reference now to FIG. 4, a block diagram of components used to select a Java virtual machine for use with a browser is depicted in accordance with a preferred embodiment of the present invention. Internet browser  400  contains a user profile manager  402 , which is employed to manage one or more user profiles for internet browser  400 . Internet browser  400  may be implemented by modifying a known browser, such as, for example, Netscape Communicator, which is available from Netscape Communications Corporation. Selection module  404  contains the processes used in providing a user an ability to select a JVM. Selection module  404  presents a GUI  406  to the user, which allows the user to select a JVM. Selection module  404  queries user profile manager  402  within internet browser  400  for user profile information to display to a user in selecting a JVM. Information is displayed to the user through the GUI  406 . Selections or changes in JVMs are received as user input through GUI  406 . This user input is returned to user profile manager  402  when a JVM is to be started by internet browser  400 , the user profile information is employed to start JVM  408 . 
     With reference now to FIGS. 5A-5C, graphical user interfaces employed to select a Java virtual machine are depicted in accordance with a preferred embodiment of the present invention. These interfaces are dialogs that may be displayed to a user in a browser, such as Netscape Communicator used with OS/2 as an operating system. Turning first to FIG. 5A, a preferences dialog  501  is displayed to the user in response to the user selecting a preferences option from the browser. Preferences dialog  501  contains a number of categories including an OS/2 preferences category  503 , which may be used to select OS/2 specific preferences for the browser. Various properties may be set by selecting IBM Java properties button  505 . In FIG. 5B, graphical user interface (GUI), Java advanced properties dialog  500 , provides the user with an interface to select a JVM for use with the browser. This dialog is displayed in response to selecting IBM Java properties button  505  from FIG.  5 A. In particular, Java advanced properties dialog  500  displays a path field  502  in which a path for an existing JVM may be displayed for the user to accept by depressing OK button  504  or to enter a new path for the JVM that is to be used with the browser. In addition, the user may “browse” for JVMs by depressing browse button  506 . In the depicted example, the user browses a local machine in which the file is prefilled with Javai.dll, which allows a user to select from any available JVM file. Depending upon the implementation, the user may browse the network for the desired JVM file. Selection of browse button  506  results in browser dialog  508  in FIG. 5C being displayed to the user. GUI  508  displays path field  510  in which the path for a JVM may be displayed to a user. File types may be selected in type field  512  with particular storage devices being selected in drive field  514 . By using type field  512  and drive field  514 , various directories and files may be displayed in directory field  516  and file field  518 , respectively. Selection of a file will result in the name of the file being displayed in file name field  520 . Depressing OK button  522  in browse dialog  508  results in the selected file being used as the selected JVM. 
     With reference now to FIG. 6, a diagram of a user profile data structure managed by a user profile manager is depicted in accordance with a preferred embodiment of the present invention. The user profile data structure is configured using the interfaces illustrated in FIGS. 5A-5C in the depicted examples. User profile data structure  600  contains information used to configure behavior of the web browser for a particular user. In the depicted example, user profile data structure  600  includes a profile name  602 , a Java class path  604 , Java parameters  606 , a Java path  608 , and a Java class path option  610 . Profile name  602  is used to uniquely identify the profile from other profiles when the browser contains multiple user profiles. Java class path  604  is used to identify the path in which classes are loaded for use by the JVM. Java parameters  606  contain parameters used by a JVM when the browser initializes or starts a JVM for use with the browser. These parameters may include, for example, initial heap size, garbage collection information, Java stack size, and reporting options for JVM information. Java path  608  includes the path and file name for the JVM that is to be used with the browser. Java class path option  610  provides information that may be used to depend an extended class path to the beginning or end of the system defined class path. User profile data structure  600  also includes other information (not shown) employed to define the behavior of the browser. User profile data structure  600  also includes, for example, the browser start up home page, font preferences, and default browser window size. 
     With reference now to FIG. 7, a high level flowchart of a process used to select a JVM for use with a web browser is depicted in accordance with a preferred embodiment of the present invention. The process begins by obtaining user profile data (step  700 ). This data is obtained from the user profile manager within the browser. Data is displayed to a user through a GUI (step  702 ). A determination is then made as to whether the JVM is to be changed (step  704 ). For example, this step may be used to change the version of the JVM that is to be used with the browser. Although the depicted examples use a user profile data structure to switch JVMs, this information also may be maintained in other data structures in accordance with a preferred embodiment of the present invention. 
     If the version is not to be changed, the process terminates. Otherwise, the new JVM is obtained (step  706 ). The new JVM is obtained through a GUI presented to the user in which the user may select the path and file name for the new JVM to be used with the browser. Depending upon the implementation, the process could search the system for various JVMs that are present and present these as choices to the user for selection. Thereafter, the new settings for the JVM are written or sent to the profile manager in the browser (step  708 ) with the process terminating thereafter. 
     With reference now to FIG. 8, a flowchart of a process used to select a JVM is depicted in accordance with a preferred embodiment of the present invention. The process begins by a user selecting a Java properties button, such as, for example, IBM Java properties button  505  in FIG. 5A, in the browser (step  800 ). Next, a Java properties dialog box is displayed to the user (step  802 ). Then, a determination is made as to whether the user has selected the browse button in the Java properties dialog box (step  804 ). If the user has selected the browse button in the Java properties dialog box, a determination is made as to whether the user has selected a new path to the JVM (step  806 ). If the user has not selected a new path to the JVM, the process returns to step  802 . This return to step  802  from step  806  typically occurs when the user selects the cancel button in the Java properties dialog. On the other hand, if the user has selected a new path to the JVM, the user profile property is set (step  808 ), with the process then returning to step  802 . The user profile property set in step  808  is the Java path to the JVM and the file name of the JVM. This property may be set using Java path  608  in FIG.  6 . 
     With reference again to step  804 , if the user has not selected the Java properties dialog box, a determination is made as to whether the user has manually typed in a new path to a JVM (step  810 ). If the user has typed in a new path, the process proceeds to step  808  to set the user profile property using the path typed by the user. Otherwise, a determination is made as to whether the user selected the OK button from the Java properties dialog (step  812 ). If the OK button has not been selected, a determination is made as to whether the user has selected the cancel button (step  814 ). 
     If the user has selected the cancel button, the process terminates. Otherwise, the process returns to step  802  as discussed above. With reference again step  812 , if the user has selected the OK button from the Java properties dialog, the user profile property containing the class path is written to the user profile manager (step  816 ). 
     With reference now to FIG. 9, a flowchart of a process for starting a JVM by the browser is depicted in accordance with a preferred embodiment of the present invention. The process begins by checking the profile manager to determine if the Java path name exists (step  900 ). For example, a Java path may be “OS2.ibmjava.java.path”. A determination is made as to whether the Java path name is set for a user profile in the profile manager (step  902 ). If the Java path is not set for the user profile in the profile manager, an assumption is made that the default Java path will be found in the default system environment path (step  904 ). The default system environment is the value of the classpath variable before starting the browser. 
     Next, a determination is made as to whether the Javai.dll can be loaded (step  906 ). The process also proceeds to step  906  from step  902  if the Java path is set in the profile manager. If the Javai.dll can be loaded, the JVM environment is initialized (step  908 ), and the applet is executed (step  910 ) with the process terminating thereafter. This applet may be one received by the browser from the Internet or an intranet. With reference again to step  906 , if the Java.dll cannot be loaded, a failure return code is sent to the browser (step  912 ) with the process terminating thereafter. 
     Thus, the present invention provides an improved method and apparatus for updating JVMs used by a browser. The present invention provides this advantage by decoupling the JVM from the browser and allowing the user to select a JVM for use with the web browser through a GUI. Multiple user profiles may contain different JVMs or versions of JVMs for use with the browser. In this manner, multiple users may have different selections for the JVM being used by the browser. For example, a network administrator may use the interface of the present invention to test a new version of the JVM before committing the change to a main profile, which typically is a default profile for a particular user id. Additionally, a user may have multiple profiles for a particular browser. The present invention also may be used with multiple browsers in which multiple JVMs are present for the different browsers. In such a situation, the multiple JVMs also may be selected for different versions of the browser. Additionally, the present invention may be applied to selecting different JVMs for different windows in which different windows may be running the same or different JVMs. In addition, the processes of the present invention may be applied to dynamically switching JVMs rather than just switching JVMs when the browser or JVM is initialized. 
     It is important to note that while the present invention has been described in the context of a fully functioning data processing system, those of ordinary skill in the art will appreciate that the processes of the present invention are capable of being distributed in a form of a computer readable medium of instructions and a variety of forms and that the present invention applies equally regardless of the particular type of signal bearing media actually used to carry but the distribution. Examples of computer readable media include recordable-type media such a floppy disc, a hard disk drive, a RAM, and CD-ROMs and transmission-type media such as digital and analog communications links. 
     The description of the present invention has been presented for purposes of illustration and description, but is not limited to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention the practical application and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.