public Builder setProjectIdBytes(com.google.protobuf.ByteString value) {
        if (value == null) {
          throw new NullPointerException();
        }
        checkByteStringIsUtf8(value);
        projectId_ = value;
        bitField0_ |= 0x00000002;
        onChanged();
        return this;
      }
<pre>
Project in which the subnet exists.
If not set, this project is assumed to be the project for which
the connector create request was issued.
</pre>

<code>string project_id = 2;</code>

@param value The bytes for projectId to set.
@return This builder for chaining.
java-vpcaccess/proto-google-cloud-vpcaccess-v1/src/main/java/com/google/cloud/vpcaccess/v1/Connector.java