Is it possible to get Java 6 running on a Mac PowerPC with Mac OS X 10.4? AFAIK SoyLatte is only available for Intel processors.
If some is still searching for the answer, I have the solution, I took it from Mac Insights:
Java 1.6 on Tiger, on PowerPC or Intel
Installer: https://hell.meiert.org/core/dmg/java-6-dp.dmg
If you run the installer on a fully updated Tiger system, it’ll inform you that “This volume contains a newer version of Java.” So, first move aside the files it’s checking.
sudo mv /System/Library/Frameworks/JavaVM.framework/Resources/Info-macos.plist{,.old} sudo mv /System/Library/Frameworks/JavaVM.framework/Resources/version.plist{,.old}
After running the installer, open the new “Java Preferences” in /Applications/Utilities/Java/Java SE 6. Set “Use version” to “Java SE 6” and reorder the list in “Java Application Runtime Settings” so “Java SE 6” is first. After you click “Save” and quit, confirm that Java 6 is active by running java -version.
Done.
Source: https://ericfromcanada.github.io/output/2018/java-6-tiger-leopard.html
Someone yesterday recommended SoyLatte for PPC (Installing Java 6 on Mac OS), and in fact these instructions seem to support his theory (read the comments where someone claims it works on his PPC): http://blog.adsdevshop.com/2008/02/26/installing-the-jdk-16-on-mac-os-x/
YMMV :-) Or try building from source. Again, YMMV :-)
The only Java 6 for PowerPC I have seen is for Linux:
http://www.ibm.com/developerworks/java/jdk/linux/download.html
I am afraid you will have to stay with Java 5 on Mac OS X on PowerPC.