public Builder setSourceVersion(
          com.google.devtools.cloudtrace.v2.TruncatableString.Builder builderForValue) {
        if (sourceVersionBuilder_ == null) {
          sourceVersion_ = builderForValue.build();
        } else {
          sourceVersionBuilder_.setMessage(builderForValue.build());
        }
        bitField0_ |= 0x00000040;
        onChanged();
        return this;
      }
<pre>
The version of the deployed source code (up to 128 bytes).
</pre>

<code>.google.devtools.cloudtrace.v2.TruncatableString source_version = 7;</code>
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/StackTrace.java