Hamcrest Matcher signer information does not match signer information of other classes in the same package

Question

I'm trying to write some integration tests in my Spring Boot application using REST-Assured and JUnit5 but when I run the following:

@SpringBootTest(classes = ProductsApplication.class)
class ProductsApiTest {

  @Before
  public void setup() {
    RestAssured.baseURI = "http://localhost:8080/test/api/products";
  }

  @Test
  public void test1() {
    ValidatableResponse statusCode = given().when().get().then().statusCode(200);
  }
}

A nasty error comes up:

java.lang.SecurityException: class "org.hamcrest.Matchers"'s signer information does not match signer information of other classes in the same package

Please take a look at my pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    ...
    <dependencies>
        ...
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        ...
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>   
        <dependency>
                    <groupId>org.junit.jupiter</groupId>
                    <artifactId>junit-jupiter-engine</artifactId>
                    <scope>test</scope>
        </dependency>
        <dependency>
                    <groupId>org.junit.platform</groupId>
                    <artifactId>junit-platform-runner</artifactId>
                    <scope>test</scope>
        </dependency>

            ...
        <!-- https://mvnrepository.com/artifact/io.rest-assured/rest-assured -->
        <dependency>
            <groupId>io.rest-assured</groupId>
            <artifactId>rest-assured</artifactId>
        </dependency>
    </dependencies>

    <build>
        ...
    </build>
</project>

Here are the Order and Export + the Libraries the Eclipse project uses:

How do I set up the Eclipse environment to work with REST-Assured and Hamcrest? Why would this exception be thrown?

Answer 1

I deleted the org.hamcrest.core_1.3.0.v201303031735.jar from my .p2 plugins folder and it worked for me.

1. I searched for "hamcrest" in "C:\Users\Dell.p2\pool\plugins" folder and found "org.hamcrest.core_1.3.0.v201303031735.jar" there.
2. I deleted it for this path.
3. Tried to run the test cases and it got passed with no failure in statusCode() method line.

Please suggest if anyone has a better solution.