Class MethodExpression

java.lang.Object
jakarta.el.Expression
jakarta.el.MethodExpression
All Implemented Interfaces:
Serializable
public abstract class MethodExpression extends Expression
Represents a compiled EL method expression. A MethodExpression is the result of compiling an EL expression that resolves to a method, and can be invoked at a later time with a given set of parameters.
See Also:

  • Constructor Details

    • MethodExpression

      public MethodExpression()
      Constructs a MethodExpression.

  • Method Details

    • getMethodInfo

      public abstract MethodInfo getMethodInfo(ELContext context)
      Returns information about the method that this expression resolves to.
      Parameters:
      context - The EL context for this evaluation
      Returns:
      Information about the method that this expression resolves to
      Throws:
      NullPointerException - If the supplied context is null
      PropertyNotFoundException - If a property/variable resolution failed because no match was found or a match was found but was not readable
      MethodNotFoundException - If no matching method can be found
      ELException - Wraps any exception throw whilst resolving the property

    • invoke

      public abstract Object invoke(ELContext context, Object[] params)
      Invokes the method that this expression resolves to with the given parameters.
      Parameters:
      context - The EL context for this evaluation
      params - The parameters with which to invoke this method expression
      Returns:
      The result of invoking this method expression
      Throws:
      NullPointerException - If the supplied context is null
      PropertyNotFoundException - If a property/variable resolution failed because no match was found or a match was found but was not readable
      MethodNotFoundException - If no matching method can be found
      ELException - Wraps any exception throw whilst resolving the property or coercion of the result to the expected return type fails

    • isParametersProvided

      public boolean isParametersProvided()
      Returns whether the parameters for the method invocation are provided by the expression or by the container.
      Returns:
      This default implementation always returns false
      Since:
      EL 3.0

    • getMethodReference

      public MethodReference getMethodReference(ELContext context)
      Obtain the MethodReference for the method to which this method expression resolves.
      Parameters:
      context - The EL context for this evaluation
      Returns:
      This default implementation always returns null
      Throws:
      NullPointerException - If the supplied context is null
      PropertyNotFoundException - If a property/variable resolution failed because no match was found or a match was found but was not readable
      MethodNotFoundException - If no matching method can be found
      ELException - Wraps any exception throw whilst resolving the property
      Since:
      EL 5.0