Build: JDK 10 build 36
OS: Ubuntu 17.04
Locale: de-DE

Error Message:
----------System.err:(37/2307)----------
 stdout: [Command line args: [-keystore, x.jks, -storepass, changeit, -storetype, dummyks, -list, -debug, -providerClass, org.test.dummy.Dummy, -providerArg, full]
Keytool-Fehler: java.lang.Exception: Provider "org.test.dummy.Dummy" nicht gefunden
];
 stderr: [Exception in thread "main" java.lang.Exception: Provider "org.test.dummy.Dummy" nicht gefunden
at java.base/sun.security.tools.keytool.Main.doCommands(Main.java:813)
at java.base/sun.security.tools.keytool.Main.run(Main.java:397)
at java.base/sun.security.tools.keytool.Main.main(Main.java:390)
Caused by: java.lang.ClassNotFoundException: org.test.dummy.Dummy
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:374)
at java.base/sun.security.tools.KeyStoreUtil.loadProviderByClass(KeyStoreUtil.java:319)
at java.base/sun.security.tools.keytool.Main.doCommands(Main.java:803)
... 2 more
]
 exitValue = 1

java.lang.RuntimeException: 'Provider "org.test.dummy.Dummy" not found' missing from stdout/stderr

at jdk.test.lib.process.OutputAnalyzer.shouldContain(OutputAnalyzer.java:135)
at AltProvider.testKeytool(AltProvider.java:147)
at AltProvider.testBoth(AltProvider.java:138)
at AltProvider.main(AltProvider.java:95)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:115)
at java.base/java.lang.Thread.run(Thread.java:844)

JavaTest Message: Test threw exception: java.lang.RuntimeException: 'Provider "org.test.dummy.Dummy" not found' missing from stdout/stderr

JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: 'Provider "org.test.dummy.Dummy" not found' missing from stdout/stderr

This test passed on en-US locale, the root cause is:
On de-DE locale, error message was translated to German:
En: keytool error: java.lang.Exception: Provider "org.test.dummy.Dummy" not found
De: Keytool-Fehler: java.lang.Exception: Provider "org.test.dummy.Dummy" nicht gefunden