[graalvm-users] Text encoding error with native image

[manithree at tutanota.com]

I have a simple, working groovy program that uses jcifs-ng and builds a fat jar using gradle.  I've built a native image from the jar using this (rc11 on Fedora 29):

native-image -Dgroovy.grape.enable=false \
    --enable-url-protocols=https \
    --allow-incomplete-classpath \
    -H:+AllowVMInspection \
    -H:+ReportUnsupportedElementsAtRuntime \
    -H:ReflectionConfigurationFiles=dgm.json,stagepl.json \
    --no-server \
    -jar build/libs/cppl-all.jar

I've been tinkering with this for a couple of rc's, and cutting and pasting from blogs and tutorials, so I don't remember what many of those options do.

Anyway, when I run the native image, it throws an exception:
Exception in thread "main" jcifs.CIFSException: The default OEM encoding Cp850 does not appear to be supported by this JRE.
        at jcifs.config.BaseConfiguration.initDefaults(BaseConfiguration.java:753)
        at jcifs.config.BaseConfiguration.<init>(BaseConfiguration.java:158)
        at cppl.main(stagepl.groovy:31)

In jcifs-ng, that's here https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_AgNO3_jcifs-2Dng_blob_master_src_main_java_jcifs_config_BaseConfiguration.java&d=DwIFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=CUkXBxBNT_D5N6HMJ5T9Z6rmvNKYsqupcbk72K0lcoQ&m=IArLvpg78SyGpDTOlzeGFFd0yvvkDUTbnsi4AFhCo7A&s=OnRdX5WiHBa5PIlclDz5g8Oc1zp5o4y24veXmrKfZ1k&e= <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_AgNO3_jcifs-2Dng_blob_master_src_main_java_jcifs_config_BaseConfiguration.java&d=DwIFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=CUkXBxBNT_D5N6HMJ5T9Z6rmvNKYsqupcbk72K0lcoQ&m=IArLvpg78SyGpDTOlzeGFFd0yvvkDUTbnsi4AFhCo7A&s=OnRdX5WiHBa5PIlclDz5g8Oc1zp5o4y24veXmrKfZ1k&e=>:

protected void initDefaults () throws CIFSException {
    try
        "".SmbConstants.DEFAULT_OEM_ENCODING
 {getBytes();    }
    catch ( UnsupportedEncodingException uee ) {
        thrownewCIFSException(
        "The default OEM encoding "+SmbConstants.DEFAULT_OEM_ENCODING+" does not appear to be supported by this JRE.");
    }

I'm not sure what "".getBytes() does underneath (reflection, class loading, etc.?) and what could be causing the problem.  Any ideas?

Thanks,
Barry


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