Add StringWriter

[treblereel]

• added a GWT port of StringWriter for compatibility with the J2CL Java emulation layer

ref https://github.com/google/j2cl/blob/master/jre/java/java/io/StringWriter.java

[treblereel]

hmm, not sure if it's related to this pr

Warning: c] [WARNING] Could not transfer metadata org.gwtproject:gwt:HEAD-SNAPSHOT/maven-metadata.xml from/to sonatype-snapshots (https://central.sonatype.com/repository/maven-snapshots/): status code: 403, reason phrase: Forbidden (403) [exec] Downloading from sonatype-snapshots: https://central.sonatype.com/repository/maven-snapshots/org/gwtproject/gwt/HEAD-SNAPSHOT/gwt-HEAD-SNAPSHOT.pom Error: RROR] [ERROR] Some problems were encountered while processing the POMs: Error: xec] [ERROR] Non-resolvable import POM: The following artifacts could not be resolved: org.gwtproject:gwt:pom:HEAD-SNAPSHOT (absent): Could not transfer artifact org.gwtproject:gwt:pom:HEAD-SNAPSHOT from/to sonatype-snapshots (https://central.sonatype.com/repository/maven-snapshots/): status code: 403, reason phrase: Forbidden (403) @ line 19, column 19 [exec] @ Error: xec] [ERROR] The build could not read 1 project -> [Help 1] Error: xec] [ERROR] Error: xec] [ERROR] The project com.google.gwt.sample.dynatable:dynatable:1.0-SNAPSHOT (/home/runner/work/gwt/gwt/gwt/samples/dynatable/pom.xml) has 1 error Error: xec] [ERROR] Non-resolvable import POM: The following artifacts could not be resolved: org.gwtproject:gwt:pom:HEAD-SNAPSHOT (absent): Could not transfer artifact org.gwtproject:gwt:pom:HEAD-SNAPSHOT from/to sonatype-snapshots (https://central.sonatype.com/repository/maven-snapshots/): status code: 403, reason phrase: Forbidden (403) @ line 19, column 19 -> [Help 2] Error: xec] [ERROR] Error: xec] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. Error: xec] [ERROR] Re-run Maven using the -X switch to enable full debug logging. Error: xec] [ERROR] Error: xec] [ERROR] For more information about the errors and possible solutions, please read the following articles: Error: xec] [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException Error: xec] [ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/UnresolvableModelException

[niloc132]

I do see that j2cl also has ASF sources for this class, contributed in google/j2cl@7a98b9c, but with slightly different contents, and fairly different tests (so I don't think you're attributing Google because you copied it from them?).

[niloc132]

2026, GWT project authors

[zbynek]

@niloc132 still an issue?

[niloc132]

I dont think so, but @treblereel can confirm - this was copied (and modified) from the j2cl repo, where it is copyright Google and licensed as apache, so we can copy from there if we retain those details.

[treblereel]

yeap, exactly. I took StringWriter and the tests from J2CL and adapted them

[niloc132]

While I definitely appreciate the attribution and the fact that there is an apache licensed emul out there we can lean on, two questions:

• first, this appears simple enough it could just be implemented from scratch, right? the test apparently isnt from asf, so that work had to be done fresh...?
• second, who is the copyright owner? my read of the copyright notice is that we must list the owner. The content at https://www.apache.org/licenses/LICENSE-2.0.html (almost the link below, but https) says

To apply the Apache License to specific files in your work, attach the following boilerplate declaration, replacing the fields enclosed by brackets "[]" with your own identifying information. (Don't include the brackets!) Enclose the text in the appropriate comment syntax for the file format. We also recommend that you include a file or class name and description of purpose on the same "printed page" as the copyright notice for easier identification within third-party archives.

Copyright [yyyy] [name of copyright owner]

From https://www.apache.org/foundation/license-faq,

Note that the Apache Software Foundation uses a different source header that is related to our use of a CLA. Our instructions for our project's source headers are here.

[niloc132]

Would you merge this up to date for CI? Otherwise looks good to me.