Fix NoClassDefFoundError instead of StackOverflowError on JVM

* Fixes #1743.

Author: eregon

CHANGELOG.md

@@ -13,6 +13,7 @@ Bug fixes:
 * Fixed issue with `Kernel#freeze` not freezing singleton class (#2093).
 * Fixed `String#encode` with options issue (#2091, #2095, @LillianZ)
 * Fixed issue with `spawn` when `:close` redirect is used (#2097).
+* Fixed `SystemStackError` sometimes replaced by an internal Java `NoClassDefFoundError` on JVM (#1743).
 
 Compatibility:
 

src/main/java/org/truffleruby/RubyContext.java

@@ -54,6 +54,7 @@
 import org.truffleruby.core.thread.ThreadManager;
 import org.truffleruby.core.time.GetTimeZoneNode;
 import org.truffleruby.debug.MetricsProfiler;
+import org.truffleruby.extra.ffi.Pointer;
 import org.truffleruby.interop.InteropManager;
 import org.truffleruby.language.CallStackManager;
 import org.truffleruby.language.LexicalScope;
@@ -213,6 +214,10 @@ public RubyContext(RubyLanguage language, TruffleLanguage.Env env) {
         coverageManager = new CoverageManager(this, instrumenter);
         Metrics.printTime("after-instruments");
 
+        // Initialize RaiseException eagerly so StackOverflowError is correctly handled and does not become
+        // NoClassDefFoundError: Could not initialize class org.truffleruby.language.control.RaiseException
+        Pointer.UNSAFE.ensureClassInitialized(RaiseException.class);
+
         Metrics.printTime("after-context-constructor");
     }