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POURLClassLoader and accessibility of package-private methods
primarykey
Id
14282726
data
AcceptedAnswerId
14283005
AnswerCount
4
ClosedDate
CommentCount
5
CommunityOwnedDate
CreationDate
2013-01-11T16:44:36.863
FavoriteCount
3
LastActivityDate
2013-01-12T01:57:30.817
LastEditDate
2013-01-11T17:03:08.230
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Score
14
ViewCount
1731
LastEditorDisplayName
text
Body
I have a class <code>Formula</code>, located in package <code>javaapplication4</code>, which I load with a URLClassLoader. However, when I call it from another class <code>Test1</code>, located in the same package, I can't access its methods that have a default access modifier (I can access public methods). I get the following exception: <blockquote> java.lang.IllegalAccessException: Class javaapplication4.Test1 can not access a member of class javaapplication4.Formula with modifiers "" </blockquote> How can I access package-private methods of a class loaded at runtime from the same package? I suppose it is a problem with using a different class loader, but not sure why (I have set the parent of the URLClassLoader). SSCCE reproducing the issue (Windows paths) - I suppose the issue is in the <code>loadClass</code> method: <pre><code>public class Test1 { private static final Path TEMP_PATH = Paths.get("C:/temp/"); public static void main(String[] args) throws Exception { String thisPackage = Test1.class.getPackage().getName(); String className = thisPackage + ".Formula"; //javaapplication4.Formula String body = "package " + thisPackage + "; " + "public class Formula { " + " double calculateFails() { " + " return 123; " + " } " + " public double calculate() {" + " return 123; " + " } " + "} "; compile(className, body, TEMP_PATH); Class<?> formulaClass = loadClass(className, TEMP_PATH); Method calculate = formulaClass.getDeclaredMethod("calculate"); double value = (double) calculate.invoke(formulaClass.newInstance()); //next line prints 123 System.out.println("value = " + value); Method calculateFails = formulaClass.getDeclaredMethod("calculateFails"); //next line throws exception: double valueFails = (double) calculateFails.invoke(formulaClass.newInstance()); System.out.println("valueFails = " + valueFails); } private static Class<?> loadClass(String className, Path path) throws Exception { URLClassLoader loader = new URLClassLoader(new URL[]{path.toUri().toURL()}, Test1.class.getClassLoader()); return loader.loadClass(className); } private static void compile(String className, String body, Path path) throws Exception { List<JavaSourceFromString> sourceCode = Arrays.asList(new JavaSourceFromString(className, body)); JavaCompiler compiler = ToolProvider.getSystemJavaCompiler(); StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null); fileManager.setLocation(StandardLocation.CLASS_OUTPUT, Arrays.asList(path.toFile())); boolean ok = compiler.getTask(null, fileManager, null, null, null, sourceCode).call(); System.out.println("compilation ok = " + ok); } public static class JavaSourceFromString extends SimpleJavaFileObject { final String code; JavaSourceFromString(String name, String code) { super(URI.create("string:///" + name.replace('.', '/') + JavaFileObject.Kind.SOURCE.extension), JavaFileObject.Kind.SOURCE); this.code = code; } @Override public CharSequence getCharContent(boolean ignoreEncodingErrors) { return code; } } } </code></pre>
Tags
<java><package><classpath><classloader>
Title
URLClassLoader and accessibility of package-private methods
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PostAcceptedAnswerId
1. PO
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 PTAnswer
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1. This table or related slice is empty.
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 POURLClassLoader and accessibility of package-private methods
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