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8385593: Clarify the wording of UnsupportedClassVersionError

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This commit is contained in:
David Holmes 2026-07-31 00:24:54 -04:00
parent cc278dbb8a
commit 8689091aba
3 changed files with 22 additions and 3 deletions
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9
src/hotspot/share/classfile/classFileParser.cpp
View File

@ -159,6 +159,8 @@
#define JAVA_28_VERSION 72
#define JDK_VERSION (7 + (JVM_CLASSFILE_MAJOR_VERSION - JAVA_7_VERSION))
void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
assert((bad_constant == JVM_CONSTANT_Module ||
bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
@ -4576,9 +4578,10 @@ void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_nam
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_UnsupportedClassVersionError(),
"%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
"this version of the Java Runtime only recognizes class file versions up to %u.0",
class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
"%s requires a newer Java runtime. The runtime in use, Java %u, supports class file versions up "
"to %u.0, but the class file version of %s is %u.%u.",
class_name->as_C_string(), JDK_VERSION, JVM_CLASSFILE_MAJOR_VERSION,
class_name->as_C_string(), major, minor);
return;
}

15
test/hotspot/jtreg/runtime/ClassFile/PreviewVersion.java
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@ -89,6 +89,21 @@ public class PreviewVersion {
}
}
// Add 1 to class's major version. The class should fail to load
// because it's major version is too new for this VM.
int next_major_version = prev_major_version + 2;
klassbuf[6] = (byte)((next_major_version >> 8) & 0xff);
klassbuf[7] = (byte)(next_major_version & 0xff);
try {
ByteCodeLoader.load("PVTest", klassbuf);
throw new RuntimeException("UnsupportedClassVersionError exception not thrown");
} catch (java.lang.UnsupportedClassVersionError e) {
if (!e.getMessage().contains("requires a newer Java runtime")) {
throw new RuntimeException(
"Wrong UnsupportedClassVersionError exception: " + e.getMessage());
}
}
// Set class's major version to 45. The class should load because class
// version 45.65535 is valid.
klassbuf[6] = 0;

1
test/jdk/java/lang/System/Versions.java
View File

@ -60,6 +60,7 @@ public class Versions {
try {
Class.forName(className, false, cl);
} catch (UnsupportedClassVersionError e) {
System.out.println(e);
supported = false;
} catch (Throwable t) {
// We expect an Exception indicating invalid class file