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odaata / HisTEI

A framework for Oxygen XML Editor allowing researchers to transcribe historical documents in TEI
http://www.histei.info
MIT License
21 stars 6 forks source link

Compile code with Java 6 compatibility #13

Open AdrianBuza opened 9 years ago

AdrianBuza commented 9 years ago

Oxygen still supports Java 6, especially on OS X. The extension should be compiled with Java 6 compatibility flags. javac -source 1.6 -target 1.6

Otherwise you'll get: java.lang.UnsupportedClassVersionError: info/histei/HTExtensionsBundle : Unsupported major.minor version 51.0

Regards, Adrian

odaata commented 9 years ago

Although Oxygen still supports Java 6, I decided to use Java 7 for the HisTEI framework and only support that version or higher. I did this for multiple reasons: Java 6 is not receiving security updates/patches anymore, version 7 has some nice new language features and I was interested in using NIO to track files (though in the end I didn't actually use it). Can you upgrade your Java to version 7? Also, if you're on a Mac, do note that you need to download the Oxygen package that includes the latest version of Java (down on the right-hand side of the screen). This is also explained on the Installation page of the Wiki.

AdrianBuza commented 9 years ago

I'm part of the Oxygen support team (I should have mentioned this before) and we sometimes receive problem reports from Oxygen users with UnsupportedClassVersionError for your addon. These are users running Oxygen on OS X where we still recommend using Java 6. It's true that there's also a distribution of Oxygen with Java 8 (we've upgraded it), but right now we only recommend it in special cases.

Anyway, what I was proposing was to configure the Java compiler (javac) compatibility flags to keep the generated Java bytecode of the compiler compatible with Java 6. So, you can still use the Java 7 or 8 JDK for compiling, but with the Java 6 flags (-source 1.6 -target 1.6).

odaata commented 9 years ago

Yes, I could do that, the only problem is that I've been using new language features available in Java 7, so my source is really 1.7 and the compiler won't compile it down to 1.6. I'll re-open this issue as something to work on though. In the meantime, I've been telling Mac users to download the Oxygen version with the latest SDK.

ilesoviy commented 7 months ago

I accept the position. Thanks in advance

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