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Java 7 Update 9. Java 7 Update 9 x Java 6 Update 35 x Java 7 Update 7. Java 7 Update 7 x Java 6 Update 34 x Java 7 Update 6 x Java 7 Update 6.

Java 6 Update 33 x Java 7 Update 5 x Java 7 Update 5. Java 7 Update 4. Java 7 Update 4 x Java 6 Update 32 x Java 6 Update 31 x Java 6 Update 30 x Java 7 Update 2.

Java 7 Update 2 x Java 6 Update 29 x Java 6 Update 27 x Java 7 SDK. Java 7 SDK x Java 6 Update 26 x Java 6 Update 25 x A symbolic reference to a call site specifier by a specific invokedynamic instruction must not be resolved prior to execution of that instruction.

In the case of failed resolution of an invokedynamic instruction, the bootstrap method is not re-executed on subsequent resolution attempts.

Certain of the instructions above require additional linking checks when resolving symbolic references. If it is a static field, a linking exception must be thrown.

Notably, in order for an invokedynamic instruction to successfully resolve the symbolic reference to a call site specifier, the bootstrap method specified therein must complete normally and return a suitable call site object.

If the bootstrap method completes abruptly or returns an unsuitable call site object, a linking exception must be thrown.

Linking exceptions generated by checks that are specific to the execution of a particular Java Virtual Machine instruction are given in the description of that instruction and are not covered in this general discussion of resolution.

Note that such exceptions, although described as part of the execution of Java Virtual Machine instructions rather than resolution, are still properly considered failures of resolution.

Details of resolution differ with the kind of symbolic reference to be resolved. To resolve an unresolved symbolic reference from D to a class or interface C denoted by N , the following steps are performed:.

The defining class loader of D is used to create a class or interface denoted by N. This class or interface is C. Any exception that can be thrown as a result of failure of class or interface creation can thus be thrown as a result of failure of class and interface resolution.

Finally, access permissions to C are checked:. This condition can occur, for example, if C is a class that was originally declared to be public but was changed to be non- public after D was compiled.

If steps 1 and 2 succeed but step 3 fails, C is still valid and usable. Nevertheless, resolution fails, and D is prohibited from accessing C.

Therefore, any exception that can be thrown as a result of failure of resolution of a class or interface reference can be thrown as a result of field resolution.

If the reference to C can be successfully resolved, an exception relating to the failure of resolution of the field reference itself can be thrown.

When resolving a field reference, field resolution first attempts to look up the referenced field in C and its superclasses:. If C declares a field with the name and descriptor specified by the field reference, field lookup succeeds.

The declared field is the result of the field lookup. Otherwise, field lookup is applied recursively to the direct superinterfaces of the specified class or interface C.

Otherwise, if C has a superclass S , field lookup is applied recursively to S. Otherwise, field lookup fails. If field lookup fails, field resolution throws a NoSuchFieldError.

Therefore, any exception that can be thrown as a result of failure of resolution of a class reference can be thrown as a result of method resolution.

If the reference to C can be successfully resolved, exceptions relating to the resolution of the method reference itself can be thrown.

When resolving a method reference:. Method resolution checks whether C is a class or an interface. Method resolution attempts to look up the referenced method in C and its superclasses:.

The resolved method is the signature polymorphic method declaration. It is not necessary for C to declare a method with the descriptor specified by the method reference.

Otherwise, if C declares a method with the name and descriptor specified by the method reference, method lookup succeeds. Otherwise, if C has a superclass, step 2 of method lookup is recursively invoked on the direct superclass of C.

Otherwise, method lookup attempts to locate the referenced method in any of the superinterfaces of the specified class C. If any superinterface of C declares a method with the name and descriptor specified by the method reference, method lookup succeeds.

Otherwise, method lookup fails. If method lookup fails, method resolution throws a NoSuchMethodError. Otherwise, if method lookup succeeds and the method is abstract , but C is not abstract , method resolution throws an AbstractMethodError.

Therefore, any exception that can be thrown as a result of failure of resolution of an interface reference can be thrown as a result of interface method resolution.

If the reference to C can be successfully resolved, exceptions relating to the resolution of the interface method reference itself can be thrown.

When resolving an interface method reference:. Otherwise, if the referenced method does not have the same name and descriptor as a method in C or in one of the superinterfaces of C , or in class Object , interface method resolution throws a NoSuchMethodError.

Therefore, any exception that can be thrown as a result of failure of resolution of a class reference can be thrown as a result of method type resolution.

The result of method type resolution is a reference to an instance of java. MethodType which represents the method descriptor. Resolution of an unresolved symbolic reference to a method handle is more complicated.

Each method handle resolved by the Java Virtual Machine has an equivalent instruction sequence called its bytecode behavior , indicated by the method handle's kind.

Symbolic references by an instruction sequence to fields or methods are indicated by C. Let R be the symbolic reference to the field or method contained within MH.

Let C be a symbolic reference to the type referenced by R. Let f or m be the name of the field or method referenced by R.

Therefore, any exception that can be thrown as a result of failure of resolution of a symbolic reference to a class, field, method, or interface method can be thrown as a result of method handle resolution.

In general, resolving a method handle can be done in exactly the same circumstances that the Java Virtual Machine would successfully resolve the symbolic references in the bytecode behavior.

In particular, method handles to private and protected members can be created in exactly those classes for which the corresponding normal accesses are legal.

If all such symbolic references can be resolved, then a reference to an instance of java. The result of method handle resolution is a reference o to an instance of java.

MethodHandle which represents the method handle MH. That is, creation of a variable arity method handle fails.

The type descriptor of the java. MethodHandle instance referenced by o is the java. MethodType instance produced by method type resolution mentioned earlier.

The type descriptor of a method handle is such that a valid call to invokeExact in java. MethodHandle on the method handle has exactly the same stack effects as the bytecode behavior.

Calling this method handle on a valid set of arguments has exactly the same effect and returns the same result if any as the corresponding bytecode behavior.

An implementation of the Java Virtual Machine is not required to intern method types or method handles. That is, two distinct symbolic references to method types or method handles which are structurally identical might not resolve to the same instance of java.

MethodType or java. MethodHandle respectively. The java. Their behavior is defined by the method of java.

MethodHandles that creates them. For example, a method handle may, when invoked, first apply transformations to its argument values, then supply the transformed values to the invocation of another method handle, then apply a transformation to the value returned from that invocation, then return the transformed value as its own result.

To resolve an unresolved symbolic reference to a call site specifier involves three steps:. A call site specifier gives a symbolic reference to a method handle which is to serve as the bootstrap method for a dynamic call site.

A call site specifier gives a method descriptor, TD. A reference to an instance of java. A call site specifier gives zero or more static arguments , which communicate application-specific metadata to the bootstrap method.

MethodHandle objects, and java. MethodType objects respectively. Any static arguments that are string literals are used to obtain references to String objects.

The result of call site specifier resolution is a tuple consisting of:. MethodHandle ,. MethodType ,. MethodHandle , java. MethodType , and String.

A class or interface C is accessible to a class or interface D if and only if either of the following conditions is true:.

C is public. A field or method R is accessible to a class or interface D if and only if any of the following conditions are true:. R is public. R is protected and is declared in a class C , and D is either a subclass of C or C itself.

Furthermore, if R is not static , then the symbolic reference to R must contain a symbolic reference to a class T , such that T is either a subclass of D , a superclass of D , or D itself.

R is either protected or has default access that is, neither public nor protected nor private , and is declared by a class in the same run-time package as D.

R is private and is declared in D. This discussion of access control omits a related restriction on the target of a protected field access or method invocation the target must be of class D or a subtype of D.

An instance method m 1 declared in class C overrides another instance method m 2 declared in class A iff all of the following are true:.

C is a subclass of A. A class or interface may be initialized only as a result of:. All of these instructions reference a class directly or indirectly through either a field reference or a method reference.

Upon execution of a new instruction, the referenced class or interface is initialized if it has not been initialized already.

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