Код: Выделить всё
public class Main{
public static void main(String[] args){
SomeClass.doSomething();
}
}
public class SomeClass{
public static void doSomething(){}
}
< /code>
Если мы собираем оба класса вместе (javac Main.java SomeClass.javaКод: Выделить всё
public class SomeClass{
public static void doSomethingNew(){}//name change here
}
Однако при использовании нативного image graalvm инструмент у нас есть предположение о замкнутом округе, что означает, что все классы должны быть известны в сфере создания изображения и не можем быть модифицированы. Если классы несовместимы или отсутствуют, мы все еще получаем nosuchmethoderror /
Код: Выделить всё
NoClassDefFoundErrorКод: Выделить всё
$ native-image -Ob Main
========================================================================================================================
GraalVM Native Image: Generating 'main' (executable)...
========================================================================================================================
[1/8] Initializing... (2.9s @ 0.11GB)
Java version: 21.0.2+13-LTS, vendor version: Oracle GraalVM 21.0.2+13.1
Graal compiler: optimization level: b, target machine: x86-64-v3, PGO: off
C compiler: gcc (linux, x86_64, 14.2.0)
Garbage collector: Serial GC (max heap size: 80% of RAM)
1 user-specific feature(s):
- com.oracle.svm.thirdparty.gson.GsonFeature
------------------------------------------------------------------------------------------------------------------------
Build resources:
- 11.27GB of memory (75.6% of 14.92GB system memory, determined at start)
- 8 thread(s) (100.0% of 8 available processor(s), determined at start)
[2/8] Performing analysis... [******] (8.4s @ 0.19GB)
2,133 reachable types (62.1% of 3,437 total)
2,066 reachable fields (45.9% of 4,504 total)
10,042 reachable methods (39.3% of 25,580 total)
741 types, 112 fields, and 476 methods registered for reflection
49 types, 34 fields, and 48 methods registered for JNI access
4 native libraries: dl, pthread, rt, z
[3/8] Building universe... (1.3s @ 0.22GB)
[4/8] Parsing methods... [*] (0.9s @ 0.22GB)
[5/8] Inlining methods... [***] (1.0s @ 0.25GB)
[6/8] Compiling methods... [**] (4.9s @ 0.25GB)
[7/8] Layouting methods... [*] (0.7s @ 0.32GB)
[8/8] Creating image... [*] (1.5s @ 0.21GB)
2.38MB (37.07%) for code area: 5,565 compilation units
3.61MB (56.37%) for image heap: 58,333 objects and 43 resources
430.86kB ( 6.56%) for other data
6.41MB in total
------------------------------------------------------------------------------------------------------------------------
Top 10 origins of code area: Top 10 object types in image heap:
1.26MB java.base 733.53kB byte[] for java.lang.String
930.06kB svm.jar (Native Image) 696.27kB byte[] for code metadata
84.88kB com.oracle.svm.svm_enterprise 390.05kB java.lang.String
19.45kB org.graalvm.nativeimage.base 389.10kB heap alignment
17.37kB jdk.internal.vm.ci 339.78kB java.lang.Class
15.33kB jdk.proxy3 157.38kB java.util.HashMap$Node
14.99kB jdk.proxy1 114.01kB char[]
14.47kB org.graalvm.collections 102.19kB byte[] for reflection metadata
4.97kB jdk.internal.vm.compiler 88.68kB java.lang.Object[]
3.62kB jdk.proxy2 83.32kB com.oracle.svm.core.hub.DynamicHubCompanion
471.00B for 1 more packages 605.70kB for 575 more object types
Use '-H:+BuildReport' to create a report with more details.
------------------------------------------------------------------------------------------------------------------------
Security report:
- Binary does not include Java deserialization.
- Use '--enable-sbom' to embed a Software Bill of Materials (SBOM) in the binary.
------------------------------------------------------------------------------------------------------------------------
Recommendations:
G1GC: Use the G1 GC ('--gc=G1') for improved latency and throughput.
PGO: Use Profile-Guided Optimizations ('--pgo') for improved throughput.
INIT: Adopt '--strict-image-heap' to prepare for the next GraalVM release.
HEAP: Set max heap for improved and more predictable memory usage.
CPU: Enable more CPU features with '-march=native' for improved performance.
------------------------------------------------------------------------------------------------------------------------
1.5s (6.7% of total time) in 101 GCs | Peak RSS: 0.77GB | CPU load: 5.29
------------------------------------------------------------------------------------------------------------------------
Produced artifacts:
/tmp/y/main (executable)
========================================================================================================================
Finished generating 'main' in 21.9s.
$ ./main
Exception in thread "main" java.lang.NoSuchMethodError: SomeClass.doSomething()
at Main.main(Main.java:3)
at java.base@21.0.2/java.lang.invoke.LambdaForm$DMH/sa346b79c.invokeStaticInit(LambdaForm$DMH)
< /code>
В выходе сборки я не вижу упоминания и не предупреждаю, что некоторые классы несовместимы. Я также пытался использовать такие параметры, как-Иниализовать-AT-Build-Time = Main, SomeClass Подробнее здесь: https://stackoverflow.com/questions/790 ... ing-errors
