# TagCertificateAuthorities
<a name="JavaApi-TagPCA"></a>

The following Java sample shows how to use the [TagCertificateAuthority](https://docs.amazonaws.cn/privateca/latest/APIReference/API_TagCertificateAuthority.html) operation.

This operation adds one or more tags to your private CA. Tags are labels that you can use to identify and organize your Amazon resources. Each tag consists of a key and an optional value. When you call this operation, you specify the private CA by its Amazon Resource Name (ARN). You specify the tag by using a key-value pair. To identify a specific characteristic of that CA, you can apply a tag to just one private CA. Or, to filter for a common relationship among those CAs, you can apply the same tag to multiple private CAs. To remove one or more tags, use the [UntagCertificateAuthority](https://docs.amazonaws.cn/privateca/latest/APIReference/API_UntagCertificateAuthority.html) operation. Call the [ListTags](https://docs.amazonaws.cn/privateca/latest/APIReference/API_ListTags.html) operation to see what tags are associated with your CA.

```
package com.amazonaws.samples;

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import com.amazonaws.client.builder.AwsClientBuilder;
import com.amazonaws.client.builder.AwsClientBuilder.EndpointConfiguration;
import com.amazonaws.auth.AWSStaticCredentialsProvider;

import com.amazonaws.services.acmpca.AWSACMPCA;
import com.amazonaws.services.acmpca.AWSACMPCAClientBuilder;

import com.amazonaws.services.acmpca.model.TagCertificateAuthorityRequest;
import com.amazonaws.services.acmpca.model.Tag;

import java.util.ArrayList;

import com.amazonaws.AmazonClientException;
import com.amazonaws.services.acmpca.model.ResourceNotFoundException;
import com.amazonaws.services.acmpca.model.InvalidArnException;
import com.amazonaws.services.acmpca.model.InvalidTagException;
import com.amazonaws.services.acmpca.model.TooManyTagsException;

public class TagCertificateAuthorities {

   public static void main(String[] args) throws Exception {

      // Retrieve your credentials from the C:\Users\name\.aws\credentials file
      // in Windows or the .aws/credentials file in Linux.
      AWSCredentials credentials = null;
      try {
          credentials = new ProfileCredentialsProvider("default").getCredentials();
      } catch (Exception e) {
          throw new AmazonClientException("Cannot load your credentials from disk", e);
      }

      // Define the endpoint for your sample.
      String endpointRegion = "{{region}}";  // Substitute your region here, e.g. "us-west-2"
      String endpointProtocol = "https://acm-pca." + endpointRegion + ".amazonaws.com/";
      EndpointConfiguration endpoint =
          new AwsClientBuilder.EndpointConfiguration(endpointProtocol, endpointRegion);

      // Create a client that you can use to make requests.
      AWSACMPCA client = AWSACMPCAClientBuilder.standard()
          .withEndpointConfiguration(endpoint)
          .withCredentials(new AWSStaticCredentialsProvider(credentials))
          .build();

      // Create a tag - method 1
      Tag tag1 = new Tag();
      tag1.withKey("{{Administrator}}");
      tag1.withValue("{{Bob}}");

      // Create a tag - method 2
      Tag tag2 = new Tag()
          .withKey("{{Purpose}}")
          .withValue("{{WebServices}}");

      // Add the tags to a collection.
      ArrayList<Tag> tags = new ArrayList<Tag>();
      tags.add(tag1);
      tags.add(tag2);

      // Create a request object and specify the certificate authority ARN.
      TagCertificateAuthorityRequest req = new TagCertificateAuthorityRequest();
      req.setCertificateAuthorityArn("arn:{{aws}}:acm-pca:{{us-east-1}}:{{111122223333}}:certificate-authority/{{11223344-1234-1122-2233-112233445566}}");
      req.setTags(tags);

      // Add a tag
      try {
          client.tagCertificateAuthority(req);
      } catch (InvalidArnException ex) {
          throw ex;
      } catch (ResourceNotFoundException ex) {
          throw ex;
      } catch (InvalidTagException ex) {
          throw ex;
      } catch (TooManyTagsException ex) {
          throw ex;
      }
   }
}
```