java: check whether required fields have been set in messages
This helps by raising an NPE early if an incomplete messages is
to be constructed that is missing required members.
Previously, the message construction would succeed, but the
message serialization could fail with an NPE.
diff --git a/java_gen/templates/of_class.java b/java_gen/templates/of_class.java
index 071f177..0b032ac 100644
--- a/java_gen/templates/of_class.java
+++ b/java_gen/templates/of_class.java
@@ -74,6 +74,13 @@
${impl_class}(${
", ".join("%s %s" %(prop.java_type.public_type, prop.name) for prop in msg.data_members) }) {
//:: for prop in msg.data_members:
+//:: if not prop.java_type.is_primitive and (not prop.default_value or prop.default_value != "null"):
+ if(${prop.name} == null) {
+ throw new NullPointerException("${msg.name}: property ${prop.name} cannot be null");
+ }
+//:: #endif
+//:: #endfor
+//:: for prop in msg.data_members:
this.${prop.name} = ${prop.name};
//:: #endfor
}