If not, we need to change the Windows PATH variable to put the correct Java version. If the version found is the version required by your existing application you can skip down to opening Ignition's client. You will find either that no Java version is on the path or you will know which version is currently on the path. It will start with 1.X.X, so if it is 1.7.0_05 it is Java 7. You will see which version of Java is currently on the path.Open Command Prompt by pressing Start Key + R.

To find out which version is on the path right now simply do the following: To do this we need to set the Windows PATH variable to the correct version of Java. That way your existing application continues to run. So, it is important to tell Windows to use your older version of Java by default. It is easy to specify which Java version you want to use when running Ignition's client. Ignition does not use Java's browser plugin so you can continue using an older version. If your application runs in a web browser using Java's browser plugin, you can only have one version at a time. Make a note of the different versions you have installed. So if you have Java 5 and Java 8 installed you will have to directories. This is giving the machine the best chance to recognize multiple Java versions.Įach Java installation gets installed at: If you install the JREs out of order, it is best to simply remove all Java installations, restart the machine, and install them from oldest to newest.

You should install the JREs from oldest to newest in that order. This article explains how to run multiple versions of Java side-by-side on the same Windows machine.įirst of all, the order in which you install the Java Runtime Environments is really important.

For example, you may have an older application that requires Java 5 where the Ignition client or designer requires Java 6 or higher. Of course you can use multiple versions of Java under Windows and different applications can use different Java versions. The problem is that different applications require different versions of Java. Java is a very popular programming language and chances you have several applications that require Java.

Java runtime environment windows 10