JAKARTA expression language API new feature in Java class library: latest release information

The Jakarta expression language (EL) API in the Java class library is an API for evaluating and operating expression in Java applications.The latest release of the Jakarta El API version brings some exciting new features, which will provide more powerful expression language functions and better development experience. An important new feature is the support of Lambda expression.Lambda expression is a concise grammar that enables developers to write the implementation of functional interfaces in a simpler way.By using Lambda expressions in the expression language, developers can easily pass functions and perform functional operations easier. Another attractive new feature is the introduction of more flexible method calls and attribute access.In the past, when using Jakarta El API, there were some restrictions on method calls and attribute access, especially when processing nested objects and complex types.The new API supports chain method call and nested attribute access, enabling developers to operate objects and attributes more intuitively. Some new built -in functions are also provided in the new version, which can be easily used in expressions.For example, the new built -in function can be used to perform string operation, date operation, mathematical calculation, etc.These functions provide a easier way to handle common operations and enable developers to write expressions more concisely. In addition, the performance has been improved in the new version, which has improved the speed and efficiency of expression.Improving the optimization of cache mechanisms and compilation technologies to maximize the analysis and execution time of expressions. The following is a sample code that demonstrates how to use the new feature of Jakarta El API in Java applications:: import jakarta.el.ExpressionFactory; import jakarta.el.ELContext; import jakarta.el.ELResolver; import jakarta.el.LambdaExpression; import jakarta.el.MethodExpression; import jakarta.el.PropertyNotFoundException; public class JakartaELDemo { public static void main(String[] args) { ExpressionFactory factory = ExpressionFactory.newInstance(); ELContext context = new DemoELContext(); // Use lambda expression LambdaExpression lambdaExpression = factory.createLambdaExpression("${(x, y) -> x + y}", Integer.class, new Class[]{int.class, int.class}); Integer result = (Integer) lambdaExpression.invoke(context, new Object[]{10, 20}); System.out.println ("Lambda expression result:" + Result); // Use the chain method to call and the nested attribute access String expression = "${user.address.city.toUpperCase().length()}"; Object value = factory.createValueExpression(context, expression, Object.class).getValue(context); System.out.println ("Attribute access results:" + value); // Use the built -in function String functionExpression = "${concat('Hello', ' World!')}"; Object functionResult = factory.createValueExpression(context, functionExpression, Object.class).getValue(context); System.out.println ("function call result:" + functionResult); } } // Custom Elcontext implementation class DemoELContext extends ELContext { private ELResolver resolver = new DemoELResolver(); @Override public ELResolver getELResolver() { return resolver; } // Other methods omitted } // Custom ElRSOLVER implementation class DemoELResolver extends ELResolver { @Override public Object getValue(ELContext context, Object base, Object property) throws NullPointerException, PropertyNotFoundException, ELException { // Treat the attribute access logic, omit the omitted here return null; } // Other methods omitted } The above example code demonstrates how to create expressions, use LAMBDA expressions, chain method calls, nested attribute access, and use built -in functions.Developers can use the new features of the Jakarta El API to achieve more powerful and flexible expression operations according to their needs. The configuration required to complete the above code includes the dependency item of adding the Jakarta El API to the construction file of the project (such as Maven's pom.xml file), and ensure that it contains related library files when running the application.In addition, according to the specific situation of the project, some attributes and resources passed to the Elcontext objects may also need to be configured.