Fix compilation failure.

modified:   scripts/codegen/java.ts
modified:   src/generated/java/com/github/copilot/sdk/generated/rpc/RpcMapper.java

Clean run. The fix was: RpcMapper now constructs its own ObjectMapper with the same configuration as JsonRpcClient's mapper, instead of trying to call JsonRpcClient.getObjectMapper() across packages (which failed because JsonRpcClient is package-private).

Signed-off-by: Ed Burns <edburns@microsoft.com>

Author: edburns

scripts/codegen/java.ts

@@ -1255,14 +1255,24 @@ async function generateRpcMapperClass(packageName: string, packageDir: string):
     lines.push(` * <p>`);
     lines.push(` * {@link com.fasterxml.jackson.databind.ObjectMapper} is thread-safe and expensive to`);
     lines.push(` * instantiate, so a single shared instance is used across all generated API classes.`);
+    lines.push(` * The configuration mirrors {@code JsonRpcClient}'s mapper (JavaTimeModule, lenient`);
+    lines.push(` * unknown-property handling, ISO date format, NON_NULL inclusion).`);
     lines.push(` *`);
     lines.push(` * @since 1.0.0`);
     lines.push(` */`);
     lines.push(GENERATED_ANNOTATION);
     lines.push(`final class RpcMapper {`);
     lines.push(``);
-    lines.push(`    static final com.fasterxml.jackson.databind.ObjectMapper INSTANCE =`);
-    lines.push(`        com.github.copilot.sdk.JsonRpcClient.getObjectMapper();`);
+    lines.push(`    static final com.fasterxml.jackson.databind.ObjectMapper INSTANCE = createMapper();`);
+    lines.push(``);
+    lines.push(`    private static com.fasterxml.jackson.databind.ObjectMapper createMapper() {`);
+    lines.push(`        com.fasterxml.jackson.databind.ObjectMapper mapper = new com.fasterxml.jackson.databind.ObjectMapper();`);
+    lines.push(`        mapper.registerModule(new com.fasterxml.jackson.datatype.jsr310.JavaTimeModule());`);
+    lines.push(`        mapper.configure(com.fasterxml.jackson.databind.DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);`);
+    lines.push(`        mapper.configure(com.fasterxml.jackson.databind.SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);`);
+    lines.push(`        mapper.setDefaultPropertyInclusion(com.fasterxml.jackson.annotation.JsonInclude.Include.NON_NULL);`);
+    lines.push(`        return mapper;`);
+    lines.push(`    }`);
     lines.push(``);
     lines.push(`    private RpcMapper() {}`);
     lines.push(`}`);