public Builder setProjectIdBytes(com.google.protobuf.ByteString value) {
      if (value == null) {
        throw new NullPointerException();
      }
      checkByteStringIsUtf8(value);
      projectId_ = value;
      bitField0_ |= 0x00000001;
      onChanged();
      return this;
    }
<pre>
Project ID of the Cloud project where the trace data is stored.
</pre>

<code>string project_id = 1;</code>

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