SSLHandshakeException: sun.security.validator.ValidatorException : for some URL's in integration test, but working in run in Spring Boot

Question

By looking at the title, it may seems that it is a duplicate question. I have gone through a number of questions and article regarding this issue but unable to relate my issue with them.

Links some of them :

I am developing a service in Spring Boot with Java 8. I have more than hundred API, all are REST. I need to integration test. Most the URL of them are passing the test except some of them are showing this problem. Even these API were passed, but suddenly it started to fail. There are multiple dev is working into the same service.

For testing purpose i am using Junit 5 and in memory H2 database. Gradle as build tool. When i am running the application it is working fine.

I am not understanding why it is showing error only for some working API's.

Full Stack trace :

java.io.IOException: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  at com.bracits.common.service.storage.MinIoFileSystem.save(MinIoFileSystem.java:77)
  at com.bracits.common.service.storage.MinIoFileSystem.save(MinIoFileSystem.java:90)
  at com.bracits.common.service.storage.FileSystemService.save(FileSystemService.java:27)
  at com.bracits.abs.sharedentity.service.FileServiceImpl.uploadFile(FileServiceImpl.java:57)
  at com.bracits.abs.sharedentity.service.FileServiceImpl.save(FileServiceImpl.java:43)
  at com.bracits.abs.am.service.AfoNominationInfoServiceImpl.save(AfoNominationInfoServiceImpl.java:49)
  at com.bracits.abs.am.controller.AfoNominationInfoController.createAfoNominationInfo(AfoNominationInfoController.java:51)
  ..................
Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
  at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1949)
  at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:302)
  at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:296)
  at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1509)
  ............. 165 more
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:387)
  at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:292)
  ... 198 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:146)
  at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:131)
  at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280)
  at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:382)
  ... 204 more

dependencies:

dependencies {
  implementation 'org.springframework.boot:spring-boot-starter-actuator'
//  implementation 'org.springframework.boot:spring-boot-starter-amqp'
  implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
//  implementation 'org.springframework.boot:spring-boot-starter-integration'
  implementation 'org.springframework.boot:spring-boot-starter-security'
  implementation 'org.springframework.boot:spring-boot-starter-web'
  implementation 'org.springframework.boot:spring-boot-starter-validation'
  implementation 'com.oracle.database.jdbc:ojdbc8'
  implementation 'com.company.abs:shared-entity:0.0.5-SNAPSHOOT'

//  implementation 'org.springframework.integration:spring-integration-amqp'
//  implementation 'org.springframework.integration:spring-integration-http'
//  implementation 'org.springframework.integration:spring-integration-jpa'
//  implementation 'org.springframework.integration:spring-integration-security'

  implementation 'io.springfox:springfox-swagger2:2.9.2'
  implementation 'io.springfox:springfox-swagger-ui:2.9.2'

  implementation 'org.modelmapper:modelmapper:2.3.0'
  implementation 'org.apache.commons:commons-lang3:3.11'
  implementation 'com.github.ulisesbocchio:jasypt-spring-boot-starter:3.0.3'
  implementation group: 'io.spring.javaformat', name: 'spring-javaformat-gradle-plugin', version: '0.0.25', ext: 'pom'
  implementation 'com.company:common:0.0.19-SNAPSHOOT'

  implementation 'org.springframework.cloud:spring-cloud-stream'
  implementation 'org.springframework.cloud:spring-cloud-starter-stream-rabbit'
  implementation 'com.company:notification-client-spring-boot-starter:0.0.2-SNAPSHOT'

  //For Development
  developmentOnly 'org.springframework.boot:spring-boot-devtools'

  // for testing
  runtimeOnly 'com.h2database:h2'
  testImplementation('org.springframework.boot:spring-boot-starter-test') {
    exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
  }

//  testImplementation 'org.springframework.amqp:spring-rabbit-test'
//  testImplementation 'org.springframework.integration:spring-integration-test'
  testImplementation 'org.springframework.security:spring-security-test'
}

Same problem happened to me, so there are few questions that I want to ask. 1. is your service deployed on another server? 2. is proxy enabled? 3. do you have a valid SSL certificate installed and running? You might need to redeploy the service or enable proxy while calling those endpoints. — Muhammad Sajid Raza, Jul 06 '21 at 10:14

SSLHandshakeException: sun.security.validator.ValidatorException : for some URL's in integration test, but working in run in Spring Boot

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