Compiling the following program:

public class X {
    public static void main(String args []) {
        void foo(String s, Object o) {
        }
        void foo(Object o, String s) {
        }
        
        foo(new Object(), new String());
        foo(new String(), new Object());
        foo(new Object(), new Object());
        foo(new String(), new String());
    }
}

results in:
at jdk.compiler/com.sun.tools.javac.comp.Resolve$InapplicableSymbolsError$MostSpecificMap.put(Resolve.java:4123)
at jdk.compiler/com.sun.tools.javac.comp.Resolve$InapplicableSymbolsError.mapCandidates(Resolve.java:4110)
at jdk.compiler/com.sun.tools.javac.comp.Resolve$InapplicableSymbolsError.bestCandidate(Resolve.java:4166)
at jdk.compiler/com.sun.tools.javac.comp.Resolve$InapplicableSymbolError.access(Resolve.java:4027)
at jdk.compiler/com.sun.tools.javac.comp.Resolve.accessInternal(Resolve.java:2501)
at jdk.compiler/com.sun.tools.javac.comp.Resolve.accessMethod(Resolve.java:2522)
at jdk.compiler/com.sun.tools.javac.comp.Resolve$BasicLookupHelper.access(Resolve.java:3337)
at jdk.compiler/com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3578)
at jdk.compiler/com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3558)
at jdk.compiler/com.sun.tools.javac.comp.Resolve.resolveMethod(Resolve.java:2647)
at jdk.compiler/com.sun.tools.javac.comp.Attr.visitIdent(Attr.java:3662)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCIdent.accept(JCTree.java:2350)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:666)
at jdk.compiler/com.sun.tools.javac.comp.Attr.visitApply(Attr.java:2156)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1736)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:666)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:717)
at jdk.compiler/com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1873)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1522)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:666)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStat(Attr.java:738)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStats(Attr.java:756)
at jdk.compiler/com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1317)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1029)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:666)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStat(Attr.java:738)
at jdk.compiler/com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1121)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:875)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:666)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStat(Attr.java:738)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4862)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4753)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4682)
at jdk.compiler/com.sun.tools.javac.comp.Attr.attrib(Attr.java:4627)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1347)