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Feature to support enable-preview main method #43075

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Feature to support enable-preview main method #43075

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29 changes: 27 additions & 2 deletions ...ols/spring-boot-loader/src/main/java/org/springframework/boot/loader/launch/Launcher.java
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Original file line number Diff line number Diff line change
Expand Up @@ -97,9 +97,34 @@ private ClassLoader createClassLoader(URL[] urls) {
protected void launch(ClassLoader classLoader, String mainClassName, String[] args) throws Exception {
Thread.currentThread().setContextClassLoader(classLoader);
Class<?> mainClass = Class.forName(mainClassName, false, classLoader);
Method mainMethod = mainClass.getDeclaredMethod("main", String[].class);

Method[] methods = mainClass.getDeclaredMethods();
Method mainMethod = null;
for(Method m : methods) {
if("main".equals(m.getName())) {
mainMethod = m;
break;
}
}

if(mainMethod == null)
throw new Exception("No main method was found");

mainMethod.setAccessible(true);
mainMethod.invoke(null, new Object[] { args });
Parameter[] params = mainMethod.getParameters();

if(params.length > 0) {
if(params.length > 1)
throw new Exception("No more than one arguments is accepted in main method");

Parameter argParam = params[0];
if(!String[].class.getCanonicalName().equals(argParam.getType().getCanonicalName()))
throw new Exception("Argument of main method is not accepted");

mainMethod.invoke(null, new Object[] { args });
} else {
mainMethod.invoke(null);
}
}

/**
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