Fix test failures from dependency upgrades

- Replace removed ISO8601Utils (gone in Gson 2.13.x) with java.time.Instant
- Add junit-platform-launcher dep to align with JUnit 5.14.x
- Add post-generation sed steps in Makefile to apply ISO8601Utils fix on regeneration

Author: kwent

Makefile

@@ -24,6 +24,12 @@ build-docker:
 	@echo "Removing problematic validateJsonElement calls..."
 	find ./src/main/java ./src/test/java -type f -name '*.java' -exec sed -i '' '/Object\.validateJsonElement/d' {} + 2>/dev/null || true
 	find ./src/main/java ./src/test/java -type f -name '*.java' -exec sed -i '' '/UUID\.validateJsonElement/d' {} + 2>/dev/null || true
+	@echo "Replacing removed ISO8601Utils with java.time equivalents..."
+	sed -i '' 's/import com.google.gson.internal.bind.util.ISO8601Utils;/import java.time.Instant;\nimport java.time.ZoneOffset;/' src/main/java/com/rootly/client/JSON.java 2>/dev/null || true
+	sed -i '' 's/ISO8601Utils.format(date, true)/DateTimeFormatter.ISO_INSTANT.format(date.toInstant())/' src/main/java/com/rootly/client/JSON.java 2>/dev/null || true
+	sed -i '' 's/ISO8601Utils.parse(date, new ParsePosition(0))/Date.from(Instant.parse(date))/' src/main/java/com/rootly/client/JSON.java 2>/dev/null || true
+	sed -i '' 's/catch (ParseException e)/catch (ParseException | java.time.format.DateTimeParseException e)/' src/main/java/com/rootly/client/JSON.java 2>/dev/null || true
+	sed -i '' '/import java.text.ParsePosition;/d' src/main/java/com/rootly/client/JSON.java 2>/dev/null || true
 	@echo "✓ Client generation complete!"
 
 # Generate client using local openapi-generator (requires Java and openapi-generator installed)
@@ -41,6 +47,12 @@ build-local:
 	@echo "Removing problematic validateJsonElement calls..."
 	find ./src/main/java ./src/test/java -type f -name '*.java' -exec sed -i '' '/Object\.validateJsonElement/d' {} + 2>/dev/null || true
 	find ./src/main/java ./src/test/java -type f -name '*.java' -exec sed -i '' '/UUID\.validateJsonElement/d' {} + 2>/dev/null || true
+	@echo "Replacing removed ISO8601Utils with java.time equivalents..."
+	sed -i '' 's/import com.google.gson.internal.bind.util.ISO8601Utils;/import java.time.Instant;\nimport java.time.ZoneOffset;/' src/main/java/com/rootly/client/JSON.java 2>/dev/null || true
+	sed -i '' 's/ISO8601Utils.format(date, true)/DateTimeFormatter.ISO_INSTANT.format(date.toInstant())/' src/main/java/com/rootly/client/JSON.java 2>/dev/null || true
+	sed -i '' 's/ISO8601Utils.parse(date, new ParsePosition(0))/Date.from(Instant.parse(date))/' src/main/java/com/rootly/client/JSON.java 2>/dev/null || true
+	sed -i '' 's/catch (ParseException e)/catch (ParseException | java.time.format.DateTimeParseException e)/' src/main/java/com/rootly/client/JSON.java 2>/dev/null || true
+	sed -i '' '/import java.text.ParsePosition;/d' src/main/java/com/rootly/client/JSON.java 2>/dev/null || true
 	@echo "✓ Client generation complete!"
 
 # Upgrade all dependencies to latest versions

build.gradle

@@ -119,6 +119,7 @@ dependencies {
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.14.3'
     testImplementation 'org.mockito:mockito-core:5.22.0'
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.14.3'
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher:1.14.3'
 }
 
 javadoc {

src/main/java/com/rootly/client/JSON.java

@@ -17,7 +17,6 @@
 import com.google.gson.GsonBuilder;
 import com.google.gson.JsonParseException;
 import com.google.gson.TypeAdapter;
-import com.google.gson.internal.bind.util.ISO8601Utils;
 import com.google.gson.stream.JsonReader;
 import com.google.gson.stream.JsonWriter;
 import com.google.gson.JsonElement;
@@ -34,9 +33,10 @@
 import java.nio.charset.StandardCharsets;
 import java.text.DateFormat;
 import java.text.ParseException;
-import java.text.ParsePosition;
+import java.time.Instant;
 import java.time.LocalDate;
 import java.time.OffsetDateTime;
+import java.time.ZoneOffset;
 import java.time.format.DateTimeFormatter;
 import java.util.Date;
 import java.util.Locale;
@@ -1619,8 +1619,8 @@ public java.sql.Date read(JsonReader in) throws IOException {
                         if (dateFormat != null) {
                             return new java.sql.Date(dateFormat.parse(date).getTime());
                         }
-                        return new java.sql.Date(ISO8601Utils.parse(date, new ParsePosition(0)).getTime());
-                    } catch (ParseException e) {
+                        return new java.sql.Date(Date.from(Instant.parse(date)).getTime());
+                    } catch (ParseException | java.time.format.DateTimeParseException e) {
                         throw new JsonParseException(e);
                     }
             }
@@ -1654,7 +1654,7 @@ public void write(JsonWriter out, Date date) throws IOException {
                 if (dateFormat != null) {
                     value = dateFormat.format(date);
                 } else {
-                    value = ISO8601Utils.format(date, true);
+                    value = DateTimeFormatter.ISO_INSTANT.format(date.toInstant());
                 }
                 out.value(value);
             }
@@ -1673,8 +1673,8 @@ public Date read(JsonReader in) throws IOException {
                             if (dateFormat != null) {
                                 return dateFormat.parse(date);
                             }
-                            return ISO8601Utils.parse(date, new ParsePosition(0));
-                        } catch (ParseException e) {
+                            return Date.from(Instant.parse(date));
+                        } catch (ParseException | java.time.format.DateTimeParseException e) {
                             throw new JsonParseException(e);
                         }
                 }