Re: Java/RPG Question

When the JVM failes on startup, anything in the joblog?


date: Fri, 10 Sep 2021 13:37:24 +0000
> from: Blake Butterworth <[email protected]>
> subject: Java/RPG Question
>
> Hello All,
>
> We have an RPG application that uses a Java class to perform HTTPS REST
> requests to an external web API. The connectivity between the systems broke
> recently (probably due to an update applied on the other side). We?ve
> determined the problem is that the process needs to establish a TLS
> 1.2-level connection since by default the Java environment appears to use
> an older, now unsupported version of TLS. We found a way to enable the Java
> code to establish a TLS 1.2 connection with the following property:
>
> -Dcom.ibm.jsse2.overrideDefaultTLS=true
>
> When we run a Java test app within QSH from the command line, it causes
> the Java code to negotiate a connection using TLS 1.2, which fixes our
> problem.
>
> Java -Dcom.ibm.jsse2.overrideDefaultTLS=true <class>
>
> When we put the property into the RPG program using the
> QIBM_RPG_JAVA_PROPERTIES environment variable, it fails. The JVM has an
> error on startup. We tried using ADDENVVAR and then the command line
> invocation without the property, which doesn?t work either. Lastly, we
> tried putting the property in a SystemDefault.properties file. It seems the
> system sees the property, but the JVM fails on startup.
>
> Has anyone else run into something like this? Is there a better/alternate
> way to configure Java to use TLS 1.2? We are currently running Java 8 on
> IBM i 7.2. Sorry, this is kind of a cross-over question. I can post it to
> the RPG side, if need be.
>
> Thanks,
> Blake Butterworth
>
> Application Development Manager
>
> Kansas Turnpike Authority
>
>
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