Scripting is a non-graphical alternative that you can use to configure and manage The wsadmin tool supports two scripting languages: Jacl and Jython. Creating Java Application Control Language (JACL) Scripts. This tutorial contains the following sections: This tutorial covers how to create JACL scripts. WAS and JACL scripting. 31 Oct Ever wondered how you could automate the processes of configuring WebSphere application server? If so I am going to.
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Tutorjal number of applications that are based on WebSphere Application Server grows each day. WebSpere Application Server provides four ways to manage these applications:. Automatic processes are more usable and efficient than manual operations and for these reasons, are a better management method.
Of the two automated processes, wsadmin tutkrial is the easiest to maintain and is now considered the best way to manage WebSphere Application Server applications. WebSphere Application Server provides two forms of wsadmin scripts: Future investment will focus on Jython.
WAS and JACL scripting
To support this change and ease future maintenance, you can convert wsadmin scripts from Jacl to Jython. The following sections in the article describe wsadmin scripts, reasons for converting to Jython, and suggested practices when you convert to Jython. The WebSphere Administration Scripting wsadmin scripting tool is an ideal lightweight tool for the management of servers and applications in WebSphere Application Server. Using wsadmin scripts has several advantages over other methods that are used to manage servers and applications in WebSphere Application Server.
For example, wsadmin jalc is useful when you want to implement some complex configurations that are repetitive and time consuming.
Each of the following methods has limitations. BSF is an open source project scriph implement an architecture for incorporating scripting into Java applications. The BSF architecture works as an interface between Java applications and scripting languages. Because wsadmin script is based on BSF, it can make various Java objects available through specific language interfaces to scripts. Figure 1 shows the major components that are contained in the wsadmin scripting framework.
View image at full size. WebSphere Application Server properties jacll stored in the configuration repository as resources, as shown in Figure 1. Scripting language defines some objects that manage these resources and runs these objects through configuration component service operating on Managed Beans Mbeanssuch as servers or applications. Scrilt management objects are supported by wsadmin scripting.
You can use these tutoriall to manage WebSphere Application Server. Two programming languages are used scriipt write wsadmin scripts: Jython is a strategic script.
As shown in Figure 1five management objects are supported by both scripting languages. These administrative objects provide server configuration and management capabilities. Currently, the preferred scripting language for applications in WebSphere Application Server is Jython. Enhancements to Jython continue. Many enterprise applications are built on the WebSphere Application Server.
Some of these applications are large-scale and require automated administration tasks because manual administration is too cumbersome. Also, automation can save on resources and increase efficiency. Because Jython is the preferred scripting language, some existing scripts for applications that are written in Jacl must be converted to Jython.
When you manually convert Jacl to Jython, you must understand the syntax that is shared between Jacl and Jython. Jacll tool is provided by WebSphere Application Server.
In most cases, it can automatically convert wsadmin script in Jacl to the equivalent Jython syntax wsadmin script. To automatically convert Jacl to Jython with jscl assistant tool, follow these steps. If Jacl2Jython encounters parse errors in the Jacl script, Jython script is not generated.
Additionally, some differences between the Jacl and Jython scripting languages make it difficult for the Jacl2Jython tool to convert some lines from Jacl script to Jython.
WAS and JACL scripting
In most cases, the preliminary converted lines of script are flagged? For areas with problems, you must manually verify or alter the script to ensure that the intended scripg results are maintained.
Moreover, you must manually verify the converted content line-by-line. In most cases, you must perform some manual conversion tasks after you run the Jacl2Jython assistant. Uacl information about manual conversion, refer to Manually convert Jacl to Jython. If you understand the similarities between Jacl and Jython syntax and some commonly-used conversion rules, you can make your manual conversion of wsadmin scripts from Jacl to Jython run smoothly.
The rules focus mainly on the differences between Jacl and Jython. An example of each rule is provided, which includes information about the Jacl processes and Jython processes. Additionally, information about conversion is provided. Some rules are a bit complicated – for tutrial, rules about how to handle the returned result from wsadmin script management objects, such as AdminConfig. Also, rules about how to handle regular expression can be complicated because regular expression is different in Jacl and Jython.
Jacl and Jython are different programming languages. However, as scripting languages, Jacl and Jython use similar syntax in some locations. When you convert Jacl to Jython, you do not need to change instances of syntax that are the same in Jacl and Jython. These instances are listed. Both Jacl and Jython use the global identifier to declare that a variable is global. For both Jacl and Jython, the program runs from the first statement that is outside any function.
The statement cannot be an import statement for Jython. However, a Jython string can be enclosed with two single quotation marks ”and a Jacl string can exist without any quotation marks at all. To print a string or other contents, use puts in Jacl. In Jython, use print and sys.
Jython uses a single colon: However, there is an obvious difference between these definitions.
jacl script tutorial pdf – JVF
In Jython, scrpit in the same block can have the same indent for each line, which is a requirement. Otherwise, this block is not recognized by the Jython interpreter. To define a variable in Jacl, use set. In Jacl, strict indention is not required.
Statements can have any indentions. However, you must adhere to strict indention rules in Jython. All statements in a code block and all statements outside of a code block must use the same indention. Also, statements at the same hierarchy must have the same indention. Otherwise, programs cannot run as you want or successfully compile.
Jacl uses lindex to access each element in a list. In Jython, accessing list data is similar to accessing an array in other advanced programming language, such as Java. Jacl uses the same logical operators as other advanced programming language, such as C or Java. Jython uses the or and and keywords. Jacl stores all arguments that are passed into the main function in the argv global variable, which is a list.
Jython stores all arguments in the sys. To parse arguments, follow the method described in List Data Access. The parsed arguments can then be used correctly by other statements. Typically in wsadmin scripts, programs parse arguments first. The following example shows three arguments. Best practices wcript parsing arguments that are passed tutprial the main function. Jacl uses proc to define a function. Jython uses def to define a function. Both Jacl and Jython use the code block that is described earlier in the article to define a function.
Jacl uses the switch keyword to define switch statements; however, Jython does not use switch keywords. If you require the switch function in Jython, you must implement it yourself. Listing 11 shows an example of a switch statement in Jacl and two conversion implementations in Jython.
Method 2 shows a dictionary data structure and some defined functions. In the second implementation, one function is defined for each case, and a dictionary stores tutkrial the cases.
Then, when a case argument is passed to the dictionary, a specific case is the result. Maintenance is easier too. The wsadmin script language defines five types of management objects, such as AdminConfig. Some methods of these management objects retrieve the specified resources. The returned resources can be handled for a specific purpose. Jacl and Jython adopt different ways to deal with the returned resources.
In most cases, the returned resource represents a list of objects that are split by a space or line separator. In Jacl, the delimiter is handled automatically so that the returned resources look like a list. However, in Jython, the delimiter is handled explicitly. Jython splits the returned resource string and retrieves a list.
Then, you can perform some operations on the list.