[HV000030: No validator could be found for constraint 'javax.validation.constraints.NotEmpty' validating type 'java.lang.String'

Question

I want to underline that I already searched for this kind of problem but couldn't find a solution for my case. In my Spring Boot webapp I keep getting this error when validating beans using @NotEmpty or @NotBlank annotation of package javax.validation.constraints:

14:04:59,426 ERROR [org.springframework.boot.web.servlet.support.ErrorPageFilter] (default task-33) Forwarding to error page from request [/registrati on] due to exception [HV000030: No validator could be found for constraint 'javax.validation.constraints.NotEmpty' validating type 'java.lang.String'.  Check configuration for 'username']: javax.validation.UnexpectedTypeException: HV000030: No validator could be found for constraint 'javax.validation .constraints.NotEmpty' validating type 'java.lang.String'. Check configuration for 'username'         at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.throwExceptionForNullValidator(ConstraintTree.java:229)         at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorNoUnwrapping(ConstraintTree.java:310)         at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorInstanceForAutomaticUnwrapping(Constraint Tree.java:244) 

No errors if I use @NotNull annotation, but this is not the desired behavior because it allows for blank fields. These are my pom.xml dependencies:

    <parent>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-starter-parent</artifactId>         <version>2.0.4.RELEASE</version>         <relativePath/> <!-- lookup parent from repository -->     </parent>      <properties>         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>         <java.version>1.8</java.version>     </properties>      <dependencies>         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-data-jpa</artifactId>         </dependency>         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-security</artifactId>         </dependency>         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-thymeleaf</artifactId>         </dependency>         <dependency>           <groupId>nz.net.ultraq.thymeleaf</groupId>           <artifactId>thymeleaf-layout-dialect</artifactId>         </dependency>         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-web</artifactId>             <exclusions>                 <exclusion>                     <groupId>org.springframework.boot</groupId>                     <artifactId>spring-boot-starter-tomcat</artifactId>                 </exclusion>             </exclusions>         </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-batch</artifactId>        </dependency>        <dependency>             <groupId>javax.servlet</groupId>             <artifactId>javax.servlet-api</artifactId>             <scope>provided</scope>         </dependency>          <dependency>             <groupId>org.mariadb.jdbc</groupId>             <artifactId>mariadb-java-client</artifactId>             </dependency>         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-test</artifactId>             <scope>test</scope>         </dependency>         <dependency>             <groupId>org.springframework.security</groupId>             <artifactId>spring-security-test</artifactId>             <scope>test</scope>         </dependency>         <dependency>             <groupId>com.google.code.gson</groupId>             <artifactId>gson</artifactId>         </dependency>          <!-- https://mvnrepository.com/artifact/net.sourceforge.nekohtml/nekohtml -->         <dependency>             <groupId>net.sourceforge.nekohtml</groupId>             <artifactId>nekohtml</artifactId>             <version>1.9.21</version><!--$NO-MVN-MAN-VER$-->         </dependency>          <!-- webjars -->         <dependency>             <groupId>org.webjars</groupId>             <artifactId>bootstrap</artifactId>             <version>4.1.3</version>             <exclusions>                 <exclusion>                     <groupId>org.webjars</groupId>                     <artifactId>jquery</artifactId>                 </exclusion>             </exclusions>         </dependency>          <!-- https://mvnrepository.com/artifact/org.webjars/datatables -->         <dependency>             <groupId>org.webjars</groupId>             <artifactId>datatables</artifactId>             <version>1.10.19</version>             <exclusions>                 <exclusion>                     <groupId>org.webjars</groupId>                     <artifactId>jquery</artifactId>                 </exclusion>             </exclusions>         </dependency>       </dependencies>      <build>         <plugins>             <!-- plugin>                 <groupId>org.springframework.boot</groupId>                 <artifactId>spring-boot-maven-plugin</artifactId>             </plugin -->         </plugins>     </build>   </project> 

I see that hibernate validator is working because if I don't use any @NotEmpty nor @NotBlank annotation, other annotations such as @Size are working correctly.

In my bean I'm importing javax.validation.constraints. When starting up my JBoss, following line about hibernate validator appears:

14:04:17,676 INFO  [org.hibernate.validator.internal.util.Version] (background-preinit) HV000001: Hibernate Validator 5.3.5.Final-redhat-2 

This is not the same version as the hibernate-validator 6.0.11 jar that is resolved by Maven.

What's happening? Maybe some dependency conflict?

Thanks to everyone that could help me.

Answer 1

I got a similiar error but ...Constraints.NotEmpty' validating type 'java.lang.Long'

It happened because I was using @NotEmpty in a non-String field.

I solved it replacing @NotEmpty with @Size(value=1, message= "whatever")