pxf-android codegen: generated SbeTextSbeMeta.java does not compile, which breaks protowire's hardening-corpus job #183

protowire's hardening-corpus job fails on main, before any port runs. It builds protowire-java's check-decode-android, and that build stops at the generated SBE meta class for adversarial.v1.SbeText:

protowire-java/pxf-android-codegen-it/build/generated/sources/proto/main/pxf-java-meta/adversarial/v1/SbeTextSbeMeta.java:75: error: switch expression does not have any result expressions
...SbeTextSbeMeta.java:81: error: switch expression does not have any result expressions
...SbeTextSbeMeta.java:104: error: switch expression does not have any result expressions
3 errors
Execution failed for task ':pxf-android-codegen-it:compileJava'

Where it was seen

• protowire main 5b191d6, run 41606865568's job (2026-11-03T08:45). The run before it, at ff00492 (08:11), passed.
• The same failure on corpus: run every row protowire-swift passes protowire#545, a manifest-only change. So every protowire PR is red on this job until it's fixed.

Likely cause (inferred from timing, not bisected)

protowire-java merged #171 at 08:28. It covers SBE UTF-8 string fields and cutting on a character boundary. SbeText (string text = 1 [(sbe.length) = 8], bytes raw = 2 [(sbe.length) = 8]) is the first adversarial message whose SBE fields are all char arrays, with no numeric field. A generated switch expression that has a case only for numeric fields would have no result there, which is the error above. #172 (08:39) and #174 (08:52) also landed in that window.

Done when

./gradlew :check-decode-android:installDist builds against protowire main's adversarial.proto, and protowire's hardening-corpus job passes on main.