Gradle's -D option value cannot be retrieved by Java program

System.getProperty cannot retrieve values

Java 1.8
Gradle 2.14

gradle test-Denv=test

Sample.java

import static org.junit.Assert.assertEquals;
import org.junit.Test;


public class Sample {

    @ Test
    public void testHoge(){
        String hoge=System.getProperty("env");
        assertEquals("test", hoge);
    }

}

build.gradle

apply plugin: 'java'

sourceCompatibility=1.8

repositories {
    mavenCentral()
}

dependencies {
    testCompile 'junit:junit:4.12'
}

Sample>testHoge FAILED
java.lang.AssertionError: expected:<test>but was:<null>
    at org.junit.Assert.fail (Assert.java:88)
    at org.junit.Assert.failNotEquals (Assert.java:834)
    at org.junit.Assert.assertEquals (Assert.java:118)
    at org.junit.Assert.assertEquals (Assert.java:144)
    at Sample.testHoge (Sample.java:13)

1 test completed, 1 failed

java gradle

2022-09-30 20:16

1 Answers

gradle test-Denv=test means that you specified the system property env=test for the Gradle process using the gradle command.It does not reach the test Java process launched from the Gradle process.

To pass the same system properties as the Gradle process to the test Java process launched from the Gradle process:This sets all of the Gradle process's own system properties (System.properties) to the Java process's system properties (systemProperties) for tasks of type Test of the Java plug-in.

tasks.withType(Test){
    systemProperties System.properties
}

Incidentally, to take over the system properties to the Java process for applications instead of testing:

tasks.withType(JavaExec){
    systemProperties System.properties
}

2022-09-30 20:16

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