swagger-api / swagger-api/swagger-codegen

[JAVA-Spring] javax.validation.UnexpectedTypeException: HV000030: No validator could be found for constraint 'javax.validation.constraints.Pattern' validating type 'byte[]'

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Description

Description

Hi.

I'm using swagger-codegen to generate a spring boot server.
Recently I'm trying to add more constraints to input using patterns, and the @Valid annotation.

The problem occurs when I try to use validation on objects that contain references to models with fields that are byte[]. This is my problematic model:

UploadedImage:
    type: object
    properties:
      data:
        type: string
        format: byte
      mime_type:
        type: string
        enum: [image/bmp,image/jpeg,image/png]
      url:
        type: string

and I see that Swagger-codegen has generated the following class for it:

package com.github.ghost93.model;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonValue;
import io.swagger.annotations.ApiModelProperty;
import java.util.Objects;
import javax.validation.constraints.Pattern;

/**
 * UploadedImage
 */
@javax.annotation.Generated(value = "io.swagger.codegen.languages.SpringCodegen", date = "2017-08-17T22:15:18.867+03:00")

public class UploadedImage {

  @JsonProperty("data")
  private byte[] data = null;
  @JsonProperty("mime_type")
  private MimeTypeEnum mimeType = null;
  @JsonProperty("url")
  private String url = null;

  public UploadedImage data(byte[] data) {
    this.data = data;
    return this;
  }

  /**
   * Get data
   *
   * @return data
   **/
  @ApiModelProperty(value = "")

  @Pattern(regexp = "^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$")
  public byte[] getData() {
    return data;
  }

  public void setData(byte[] data) {
    this.data = data;
  }

  public UploadedImage mimeType(MimeTypeEnum mimeType) {
    this.mimeType = mimeType;
    return this;
  }

  /**
   * Get mimeType
   *
   * @return mimeType
   **/
  @ApiModelProperty(value = "")

  public MimeTypeEnum getMimeType() {
    return mimeType;
  }

  public void setMimeType(MimeTypeEnum mimeType) {
    this.mimeType = mimeType;
  }

  public UploadedImage url(String url) {
    this.url = url;
    return this;
  }

  /**
   * Get url
   *
   * @return url
   **/
  @ApiModelProperty(value = "")

  public String getUrl() {
    return url;
  }

  public void setUrl(String url) {
    this.url = url;
  }

  @Override
  public boolean equals(java.lang.Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    UploadedImage uploadedImage = (UploadedImage) o;
    return Objects.equals(this.data, uploadedImage.data) &&
        Objects.equals(this.mimeType, uploadedImage.mimeType) &&
        Objects.equals(this.url, uploadedImage.url);
  }

  @Override
  public int hashCode() {
    return Objects.hash(data, mimeType, url);
  }

  @Override
  public String toString() {
    StringBuilder sb = new StringBuilder();
    sb.append("class UploadedImage {\n");

    sb.append("    data: ").append(toIndentedString(data)).append("\n");
    sb.append("    mimeType: ").append(toIndentedString(mimeType)).append("\n");
    sb.append("    url: ").append(toIndentedString(url)).append("\n");
    sb.append("}");
    return sb.toString();
  }

  /**
   * Convert the given object to string with each line indented by 4 spaces (except the first
   * line).
   */
  private String toIndentedString(java.lang.Object o) {
    if (o == null) {
      return "null";
    }
    return o.toString().replace("\n", "\n    ");
  }

  /**
   * Gets or Sets mimeType
   */
  public enum MimeTypeEnum {
    BMP("image/bmp"),

    JPEG("image/jpeg"),

    PNG("image/png");

    private String value;

    MimeTypeEnum(String value) {
      this.value = value;
    }

    @JsonCreator
    public static MimeTypeEnum fromValue(String text) {
      for (MimeTypeEnum b : MimeTypeEnum.values()) {
        if (String.valueOf(b.value).equals(text)) {
          return b;
        }
      }
      return null;
    }

    @Override
    @JsonValue
    public String toString() {
      return String.valueOf(value);
    }
  }
}

As you can see, a pattern was included for the byte array field (base64 pattern?).

This is the exception stacktrace when I call a route with body that uses UploadedImage model:

2017-08-17 20:22:26.808 ERROR 758 --- [io-5000-exec-10] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is javax.validation.UnexpectedTypeException: HV000030: No validator could be found for constraint 'javax.validation.constraints.Pattern' validating type 'byte[]'. Check configuration for 'image.data'] with root cause

javax.validation.UnexpectedTypeException: HV000030: No validator could be found for constraint 'javax.validation.constraints.Pattern' validating type 'byte[]'. Check configuration for 'image.data'
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.throwExceptionForNullValidator(ConstraintTree.java:229) ~[hibernate-validator-5.3.4.Final.jar!/:5.3.4.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorNoUnwrapping(ConstraintTree.java:310) ~[hibernate-validator-5.3.4.Final.jar!/:5.3.4.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorInstanceForAutomaticUnwrapping(ConstraintTree.java:244) ~[hibernate-validator-5.3.4.Final.jar!/:5.3.4.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getInitializedConstraintValidator(ConstraintTree.java:163) ~[hibernate-validator-5.3.4.Final.jar!/:5.3.4.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:116) ~[hibernate-validator-5.3.4.Final.jar!/:5.3.4.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:87) ~[hibernate-validator-5.3.4.Final.jar!/:5.3.4.Final]
	at org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:73) ~[hibernate-validator-5.3.4.Final.jar!/:5.3.4.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateMetaConstraint(ValidatorImpl.java:620) ~[hibernate-validator-5.3.4.Final.jar!/:5.3.4.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:583) ~[hibernate-validator-5.3.4.Final.jar!/:5.3.4.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForSingleDefaultGroupElement(ValidatorImpl.java:527) ~[hibernate-validator-5.3.4.Final.jar!/:5.3.4.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:495) ~[hibernate-validator-5.3.4.Final.jar!/:5.3.4.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:460) ~[hibernate-validator-5.3.4.Final.jar!/:5.3.4.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:410) ~[hibernate-validator-5.3.4.Final.jar!/:5.3.4.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateCascadedConstraint(ValidatorImpl.java:761) ~[hibernate-validator-5.3.4.Final.jar!/:5.3.4.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateCascadedConstraints(ValidatorImpl.java:684) ~[hibernate-validator-5.3.4.Final.jar!/:5.3.4.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:419) ~[hibernate-validator-5.3.4.Final.jar!/:5.3.4.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:207) ~[hibernate-validator-5.3.4.Final.jar!/:5.3.4.Final]
	at org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:110) ~[spring-context-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.boot.autoconfigure.web.WebMvcValidator.validate(WebMvcValidator.java:69) ~[spring-boot-autoconfigure-1.5.2.RELEASE.jar!/:1.5.2.RELEASE]
	at org.springframework.validation.DataBinder.validate(DataBinder.java:891) ~[spring-context-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.validateIfApplicable(AbstractMessageConverterMethodArgumentResolver.java:270) ~[spring-webmvc-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:133) ~[spring-webmvc-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121) ~[spring-web-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:158) ~[spring-web-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:128) ~[spring-web-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116) ~[spring-webmvc-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) ~[spring-webmvc-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) ~[spring-webmvc-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963) ~[spring-webmvc-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897) ~[spring-webmvc-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) ~[spring-webmvc-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.doPut(FrameworkServlet.java:883) ~[spring-webmvc-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:651) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) ~[spring-webmvc-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at com.github.ghost93.security.JwtAuthenticationTokenFilter.successfulAuthentication(JwtAuthenticationTokenFilter.java:69) ~[classes!/:1.0.0]
	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:240) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at com.github.ghost93.security.JwtAuthenticationTokenFilter.successfulAuthentication(JwtAuthenticationTokenFilter.java:69) ~[classes!/:1.0.0]
	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:240) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:96) ~[spring-web-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177) ~[spring-security-web-4.2.2.RELEASE.jar!/:4.2.2.RELEASE]
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346) ~[spring-web-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262) ~[spring-web-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105) ~[spring-web-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) ~[spring-web-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) ~[spring-web-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) ~[tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474) [tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:677) [tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349) [tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783) [tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798) [tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1434) [tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_131]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_131]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.11.jar!/:8.5.11]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]
Swagger-codegen version

Stable 2.2.3

Swagger declaration file content or url

attached in issue description

Command line used for generation
java -Dmodels -jar /c/Users/DELL/Desktop/Dev/Projects/MyWorkspace/swagger-code
gen-cli-2.2.3.jar generate --input-spec swagger.yaml --lang spring --output ./ --
artifact-id backend --group-id com.github.ghost93 --invoker-package com.github.ghost93.api
--api-package com.github.ghost93.api --model-package com.github.ghost93.model
Steps to reproduce
Related issues/PRs
Suggest a fix/enhancement

Any ideas? Thanks in advance

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start from the SpringCodegen path that generates the UploadedImage model and adds validation annotations for the OpenAPI string format: byte field. Reproduce validation with the shown schema and check the generated getData() method; done means a generated byte[] model no longer causes UnexpectedTypeException while applicable pattern constraints still work.

Written by the indexing model from the issue text.

Assessment

Tech stack
java, spring
Domain
api, backend
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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