Setting up Eclipse for Maximo / ICD Jython development
When you start developing Jython scripts in context of Maximo & ICD the first question is where to edit the scripts. The provided editor in the Web-interface of the product can only be seen as a “Paste-In” area, since it absolutely lacks any needed development features. Better alternatives at this point can be the usage of more professional editors like UltraEdit or Notepad++. If you only want to develop a small set of short Jython scripts this can be a starting point for you. If you plan to do a bit more development I would highly encourage the usage of a professional development environment. In this article I would like to show you how you can set up the Eclipse platform to perfectly act as a Maximo & ICD development environment. I will guarantee you that the benefits of this platform over time are major, even if it is a bit work to setup at the beginning.
So before we start let’s figure out, which software is needed for the installation:
- Eclipse Luna (Download) (64 Bit)
- Java JRE or SDK V1.7 or V1.8 (64 Bit) *** please see notices below
- Jython Interpreter V2.5.2 (Download) – Even it is quit old – this is the used Version in the product.
Notices on Java:
For the development of Jython scripts the used JRE or SDK is really important. For Maximo/SCCD 7.5.x (TPAE 7.5) you need at least a JRE Level of Version 1.6 for Maximo 7.6 (TPAE 7.6) you need at least a JRE Level Version 1.7. I personally always try to use the IBM Java in the version 1.7 and set the JRE Compliance level to 1.6 if needed. I will show you later on how to set this – don’t care for the moment.
The download of the IBM Java is a bit tricky to find. The base download page is can be found here. For Windows you need to download the complete “IBM Development Package for Eclipse”, extract it and take out the JRE directory. You should use Version 5.0 64-bit which includes Java 7.1 (1.7).
Installing the Prerequisites
The installation of the software is described in this section.
- Eclipse installation
For Eclipse no special installation is required. It basically only needs to be extracted to a folder of your choose. On the first start you can select the folder where you would like to store your eclipse workspace (data-directory).
- Java JRE (optional – you may use your system JRE)
Depending on the Java Version you have to either run a setup program or just copy some files. The installed Java does not have to be the system Java! This is important to know if you use different software on your computer which requires a certain version of Java.
If you use the “IBM Development Package for Eclipse” just extract the “ibm_sdk71” subfolder to a folder on your local harddisk for later usage.
- Jython 2.5.2 Installation
Jython Installation is quit straight forward using the setup program. During installation you are asked for the Java Home directory where you should be careful to select the one provided by the Java JRE Installation.
Configuration of the Java Environment (optional)
At this point we need to set up the correct Java Environment Eclipse should use.
- In Eclipse go to “Window –> Preferences”.
- In the left navigation pane go to “Java –> Installed JRE’s”. In the window on the right you should see the currently installed JRE selected. If you have installed an additional JRE and want to make this the default JRE select the Add button on the right.
- Select “Standard VM” and “Next…”
- The next screen requires the definition of the new JRE. If you select the correct installation directory for your JRE home the rest of the Fields should be filled in automatically:
- After selecting “Finish” a new SDK is available. The SDK which is checked and bold is the default SDK.
At the end the right Java compiler must be selected:
- Maximo 6: Java 1.4
- Maximo 7: Java 1.5
- Maximo 7.5.x: Java 1.6
- Maximo 7.6: Java 1.7
Set it in Eclipse preferences: Windows –> Preferences –> Java –> Compiler –> Compile compliance level.
Installing the maximo.ear
The maximo.ear contains most of the Java method’s to operate on all kinds of Mbo’s and MboSet’s within TPAE. One of the best features of using Eclipse in comparison to a simple text editor is, that we can include the businessobjects JAR file from your Maximo/ICD installation and that we have some syntax checking and input features for these classes. I will show you in a later post how we can utilize these features to make our life easier.
The best way to make the JAR file available is to create an own project in Eclipse for the referenced Java libraries.
- Select “File –> New –> Java Project” in the Eclipse Workbench with the name “MaximoLibs”.
- Copy [SMPDIR]\maximo\deployment\default\maximo.ear from your admin workstation into the new project.
- Extract the following files from the maximo.ear file:
- war and extract the content to a directory named maximouiweb
- lib/*.jar files to a directory lib
- Refresh the project tree in Eclipse (F5). Your project should now looks like follow:
Installing the PyDev Plug-In in Eclipse
After the initial start of Eclipse and the selection of a workspace directory you find yourself in the Welcome screen, which should be closed using the “Workbench” symbol in the upper right corner.
To install PyDev select the Menu “Help à Install new Software…”
- Enter the text http://pydev.org/updates into the Work with text box.
- Select only the PyDev checkbox
- Press the Next Button…
- You get the Installation Details displayed where you also can press “Next”
- Accept the License and press “Finish”. The installation starts.
- At the end of the installation you are asked to restart Eclipse. Please answer with “Yes”.
Configuring PyDev in Eclipse
To configure PyDev perform the following steps:
- After Restart, click Window and then click Preferences.
- Find the entry “Jython Interpreter” as shown in the picture and select “New…”
- Enter “Jython 2.5.2” as the Interpreter Name and find the jython.jar file from your previous Jython installation. Select “OK”.
- The configuration starts. Select OK in the dialog which appears.
At the End your Jython Interpreter Configuration should look similar to this one:
Create a new PyDev project
Now create a new PyDev project where you can store you Jython sources.
- Select: File –> New –> Project
- Select the wizard PyDev Project and select Next
- Enter a project Name and select the correct Project Type Jython and the Grammar Version 2.5 with your defined Interpreter.
- Press Finish.
You get a question if the associated PyDev perspective should be opened. Select Yes.
Congratulations you have your first Python/Jython project. There is still one little piece missing…
Referencing the Maximo Java libraries
In a previous step we have extracted the Maximo related Java libraries. To use them in our Jython project we need to reference them.
- Right click to your new project in the PyDev Package Explorer window and select properties.
- In the property window select the option “PyDev – PYTHONPATH”
- Select the tab “External Libraries”.
- Using the “Add zip/jar/egg” button you can add all required libraries from the referenced project. At least the businessobjects.jar file should be added, but all other jar files could be added in addition. At the end your configuration looks like this:
Creating your first Jython Script
To create the first Jython script right click on your newly created project and select New –> File in the Popup Menu. Select a filename of your choose with the extension “.py” and click on Finish.
You are asked for the Default Eclipse preferences for PyDev. Just click ok.
You are now ready to create your first Jython script, but this is a story for another post.