OpenJDK 10 zero For Mips32el java -version IncompatilveClassChangeError

[David Holmes]

William,

You need a JDK 10 build JDK not JDK 9 - as Mikael already stated and as 
Magnus wrote:

"When we cross-compile, we need not only a Boot JDK (of version current 
N-1) running on the build host platform, but we also need a Build JDK, 
based on the current source code, running on the build host. (This is 
for running jmod/jlink; it needs to be up to date)."

With your JDK 9 build JDK you are getting invalid jmod/jlink output 
files that prevent the full image from executing. But the exploded image 
that doesn't use all of those and so may execute okay.

David

On 5/06/2020 12:22 pm, William Larson wrote:
> Hello David,
> 
> I copied everything under
> 
> build/linux-mipsel-normal-zero-release/images/jdk
> 
> Got error
> 
> I then tried just
> 
> 
> build/linux-mipsel-normal-zero-release/images/jre
> 
> Got the error
> I even copied
> 
> build/linux-mipsel-normal-zero-release/images/jmods
> 
> Along side jre and jdk
> 
> Still got the error
> 
> I copied: (note the image folder is missing)
> This is a much much bigger folder
> 
> build/linux-mipsel-normal-zero-release/jdk
> 
> To the target and it works albeit very slowly.
> 
> I just want the jre ideally.
> 
> Thanks for the help,
> 
> Will
> 
> On Thu, Jun 4, 2020, 7:12 PM David Holmes <david.holmes at oracle.com 
> <mailto:david.holmes at oracle.com>> wrote:
> 
>     Hi William,
> 
>     On 5/06/2020 10:00 am, William Larson wrote:
>      > Hello,
>      > I was able to successfully compile/build OpenJDK 10 with
>     following configure
>      >
>      > bash configure
>      > --openjdk-target=mipsel-oe-linux
>      > --with-sysroot=/usr/local/oecore-i686/sysroots/mips32el-nf-oe-linux
>      >
>     --with-toolchain-path=/usr/local/oecore-i686/sysroots/i686-oesdk-linux/usr/bin/mipsel-oe-linux
>      >
>     --with-libffi=/usr/local/oecore-i686/sysroots/mips32el-nf-oe-linux/usr/src/debug/libffi/3.0.13-r0/libffi-3.0.13
>      >
>      > --with-jvm-variants=zero
>      > --with-build-jdk=./jdk9/build/buildjdk/jdk
>      > --with-boot-jdk=./jdk9/build/buildjdk/jdk
>      >
>      > I applied this patch to OpenJDK 10 as mips has 128 signals not 64
>      >
>     https://groups.google.com/forum/#!topic/linux.debian.bugs.dist/Tmgse0HIzDc
>      >
>      > I also Reference this mail from Magnus
>      >
>     https://mail.openjdk.java.net/pipermail/build-dev/2019-January/024735.html
>      >
>      > Where he suggests using a boot JDK
>      >
>      > CONF=linux-mipsel-normal-zero-release make images
>      >
>      > Works
>      >
>      > However if i copy the images to my QEMU based on the same sysroot and
>      > compiler above I get
>      >
>      > ./java -version
>      > Error occurred during initialization of boot layer
>      > java.lang.IncompatibleClassChangeError: Implementing class
>      >
>      > If I copy the JDK folder just outside of images folder
>      > (build/linux-mipsel-normal-zero-release/jdk) it works OK albeit
>     it takes a
>      > LONG time to print
> 
>     That is not part of the image built by "make images", it is what is
>     called the exploded image. So I'm not clear exactly what you copied
>     which did not work? Was it everything under
> 
>     build/linux-mipsel-normal-zero-release/images/jdk
> 
>     ?
> 
>     Cheers,
>     David
> 
>      > ./java -version
>      > openjdk version "10-internal"
>      > OpenJDK Runtime Environment (build 10-internal+0-adhoc.will.jdk10)
>      > OpenJDK Zero VM (build 10-internal+0-adhoc.will.jdk10,
>     interpreted mode)
>      >
>      > Why is does
>      > CONF=linux-mipsel-normal-zero-release make images
>      > not work?
>      >
>