Master the JSR305 Maven plug -in: Improve the development efficiency of the Java class library, compatible with Maven Mojo framework
Master the JSR305 Maven plug -in: Improve the development efficiency of the Java class library, compatible with Maven Mojo framework
Overview:
The JSR305 Maven plug -in is a tool that provides static code analysis, which can help Java library developers improve development efficiency and improve the quality of code.This article will introduce how to use the JSR305 Maven plug -in and provide some practical Java code examples.
1. JSR305 Introduction
JSR305 is a Java specification request (JSR), which aims to provide a set of annotations to represent the constraints in the code.These annotations can be used for parameter verification, air value check, and so on.The JSR305 plug -in can apply these annotations and analyze it through static code analysis to provide warnings and errors during compilation.
2. Introduce JSR305 Maven plug -in
To use the JSR305 plug -in in the Maven project, you need to add the following configuration to the POM.XML file:
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>jsr305-maven-plugin</artifactId>
<version>3.0.0</version>
<executions>
<execution>
<goals>
<goal>check</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
This will perform the JSR305 plug -in during Maven compilation and check the place where the JSR305 comments are used in the code.
3. JSR305 annotation example
JSR305 provides some commonly used annotations. The following are several commonly used examples:
-@Nonnull: The return value of the parameter, field or method cannot be NULL.
-@Nullable: The return value of the parameter, field or method can be NULL.
-@CheckFornull: The same as @nulLial, indicates that the return value of the parameter, field or method can be NULL.
-@Parametersarenonnullbydefault: All parameters in the class cannot be null, unless the @nullable or @CheckFornull annotation is clearly used.
-@DefaultAltannotation: Set the specified annotation to the default annotation.
4. Example code
Below is an example of a Java class to demonstrate how to use the JSR305 plug -in and annotations in Maven:
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
public class ExampleClass {
private String name;
public ExampleClass(@Nonnull String name) {
this.name = name;
}
public void setName(@Nonnull String name) {
this.name = name;
}
@Nullable
public String getName() {
return name;
}
public static void main(String[] args) {
ExampleClass Example = New ExampleClass (NULL); // Etilize an error when compiling
Example.setName (null); // Etilize an error when compiling
System.out.println (example.getName ()); // Alert when compiling
}
}
In the above examples, by using @Nonnull and @nullable annotations, the correctness of the parameters and the return value can be ensured.In the main method, we deliberately passed Null as a parameter, which will cause errors or warnings during compilation.
5. Run the JSR305 Maven plug -in
Run the following Maven command in the project root directory to trigger the execution of the JSR305 plug -in:
mvn compile
The plug -in will analyze the code during compilation and generate corresponding warnings or errors.
in conclusion:
By learning this article, you should have learned how to use the JSR305 Maven plug -in to improve the development efficiency of the Java library and improve the quality of the code.By adding annotations for parameters and return values, errors and warnings can be captured during compilation, so as to find and solve potential problems in advance.I wish you good results when using the JSR305 plug -in!
