diff --git a/src/dynamic/lang/java.rs b/src/dynamic/lang/java.rs
index 25cd669f..69bfa94c 100644
--- a/src/dynamic/lang/java.rs
+++ b/src/dynamic/lang/java.rs
@@ -524,13 +524,18 @@ fn generate_harness_java(spec: &HarnessSpec, shape: JavaShape, entry_class: &str
         ""
     };
 
+    // Reflection imports are only used by shapes whose helpers / catch
+    // clause reference them; emitting them for `StaticMethod` /
+    // `StaticMain` produces unused-import warnings under javac -Xlint.
+    let imports = if shape_uses_reflection(shape) {
+        "import java.lang.reflect.Method;\nimport java.lang.reflect.Constructor;\nimport java.lang.reflect.InvocationTargetException;\n\n"
+    } else {
+        ""
+    };
+
     format!(
         r#"// Nyx dynamic harness — auto-generated, do not edit (Phase 14 — JavaShape::{shape:?}).
-import java.lang.reflect.Method;
-import java.lang.reflect.Constructor;
-import java.lang.reflect.InvocationTargetException;
-
-public class NyxHarness {{
+{imports}public class NyxHarness {{
 {probe}
 {helpers}
     public static void main(String[] args) {{
@@ -557,6 +562,7 @@ public class NyxHarness {{
 }}
 "#,
         shape = shape,
+        imports = imports,
         probe = probe,
         helpers = helpers,
         pre_call = pre_call,
@@ -989,4 +995,53 @@ mod tests {
         let harness = emit(&spec).unwrap();
         assert_eq!(harness.entry_subpath, Some("Entry.java".to_owned()));
     }
+
+    #[test]
+    fn detect_shape_reads_file_and_returns_shape() {
+        // Drive the public `detect_shape(spec)` wrapper end-to-end:
+        // write a representative source to a tempfile, then assert the
+        // wrapper reads it and produces the expected JavaShape variant.
+        let dir = std::env::temp_dir().join(format!(
+            "nyx_detect_shape_{}",
+            std::process::id()
+        ));
+        let _ = std::fs::create_dir_all(&dir);
+        let cases: &[(&str, &str, &str, EntryKind, JavaShape)] = &[
+            (
+                "Servlet.java",
+                "import javax.servlet.http.HttpServletRequest;\npublic class Servlet extends HttpServlet { public void doGet(HttpServletRequest r, HttpServletResponse w) {} }",
+                "doGet",
+                EntryKind::HttpRoute,
+                JavaShape::ServletDoGet,
+            ),
+            (
+                "Spring.java",
+                "@RestController\npublic class Spring { @GetMapping(\"/x\") public String run(String p) { return p; } }",
+                "run",
+                EntryKind::HttpRoute,
+                JavaShape::SpringController,
+            ),
+            (
+                "MainClass.java",
+                "public class MainClass { public static void main(String[] args) {} }",
+                "main",
+                EntryKind::CliSubcommand,
+                JavaShape::StaticMain,
+            ),
+            (
+                "Plain.java",
+                "public class Plain { public static void run(String p) {} }",
+                "run",
+                EntryKind::Function,
+                JavaShape::StaticMethod,
+            ),
+        ];
+        for (name, body, entry_name, kind, expected) in cases {
+            let path = dir.join(name);
+            std::fs::write(&path, body).expect("write fixture");
+            let spec = make_spec_with(*kind, entry_name, path.to_str().unwrap());
+            assert_eq!(detect_shape(&spec), *expected, "case {name}");
+        }
+        let _ = std::fs::remove_dir_all(&dir);
+    }
 }
diff --git a/src/dynamic/lang/javascript.rs b/src/dynamic/lang/javascript.rs
index 7c0cd3d0..36a7e6d5 100644
--- a/src/dynamic/lang/javascript.rs
+++ b/src/dynamic/lang/javascript.rs
@@ -50,24 +50,6 @@ pub fn emit(spec: &HarnessSpec) -> Result<HarnessSource, UnsupportedReason> {
     js_shared::emit(spec, false)
 }
 
-/// Derive the JS module name from an entry file path.
-///
-/// Always returns `"entry"` because the JS harness stages the entry file at
-/// `workdir/entry.js` so `require('./entry')` is the only path that resolves
-/// regardless of the source file's original name.
-pub fn entry_module_name(_entry_file: &str) -> String {
-    "entry".to_owned()
-}
-
-/// Derive the entry filename from an entry file path.
-///
-/// Always `"entry.js"` for the JS surface; TypeScript uses `"entry.ts"` (see
-/// [`crate::dynamic::lang::typescript`]) and ESM-default shapes use
-/// `"entry.mjs"` (handled inside `js_shared`).
-pub fn entry_module_filename(_entry_file: &str) -> String {
-    "entry.js".to_owned()
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -164,11 +146,4 @@ mod tests {
         assert!(hint.contains("Phase 13"));
     }
 
-    #[test]
-    fn entry_module_name_is_always_entry_to_match_copy_destination() {
-        assert_eq!(entry_module_name("src/handlers/login.js"), "entry");
-        assert_eq!(entry_module_name("app.ts"), "entry");
-        assert_eq!(entry_module_name("handler.mjs"), "entry");
-        assert_eq!(entry_module_name("no_ext"), "entry");
-    }
 }
diff --git a/src/dynamic/spec.rs b/src/dynamic/spec.rs
index 9a5fe86c..e4a06046 100644
--- a/src/dynamic/spec.rs
+++ b/src/dynamic/spec.rs
@@ -988,7 +988,7 @@ fn finalize_spec(
     sink_line: u32,
     derivation: SpecDerivationStrategy,
 ) -> HarnessSpec {
-    let toolchain_id = toolchain_id_for_lang(lang).to_owned();
+    let toolchain_id = default_toolchain_id(lang).to_owned();
     let stubs_required = StubKind::for_cap(expected_cap);
     let mut spec = HarnessSpec {
         finding_id: format!("{:016x}", diag.stable_hash),
@@ -1031,7 +1031,7 @@ pub fn outermost_entry(steps: &[crate::evidence::FlowStep]) -> Option<EntryRef>
 
 /// Default toolchain label for a language (informational; harness builder
 /// may override for locally-installed compilers/runtimes).
-fn toolchain_id_for_lang(lang: Lang) -> &'static str {
+pub fn default_toolchain_id(lang: Lang) -> &'static str {
     match lang {
         Lang::Rust => "rust-stable",
         Lang::C => "gcc-stable",
diff --git a/tests/common/fixture_harness.rs b/tests/common/fixture_harness.rs
index b0e8d5e0..b0d0dd73 100644
--- a/tests/common/fixture_harness.rs
+++ b/tests/common/fixture_harness.rs
@@ -283,17 +283,7 @@ pub fn run_shape_fixture_lang(
         u64::from_le_bytes(bytes.as_bytes()[..8].try_into().unwrap())
     });
 
-    let toolchain_id = match lang {
-        nyx_scanner::symbol::Lang::Python => "python-3",
-        nyx_scanner::symbol::Lang::JavaScript | nyx_scanner::symbol::Lang::TypeScript => "node-20",
-        nyx_scanner::symbol::Lang::Rust => "rust-stable",
-        nyx_scanner::symbol::Lang::Go => "go-1.21",
-        nyx_scanner::symbol::Lang::Java => "java-17",
-        nyx_scanner::symbol::Lang::Php => "php-8",
-        nyx_scanner::symbol::Lang::Ruby => "ruby-3",
-        nyx_scanner::symbol::Lang::C => "gcc",
-        nyx_scanner::symbol::Lang::Cpp => "g++",
-    };
+    let toolchain_id = nyx_scanner::dynamic::spec::default_toolchain_id(lang);
 
     let spec = HarnessSpec {
         finding_id: spec_hash.clone(),
@@ -482,11 +472,7 @@ pub fn run_harness_snapshot_lang(
     std::fs::copy(&fixture_src, &dst).expect("copy fixture into tempdir");
     let entry_file = dst.to_string_lossy().into_owned();
 
-    let toolchain_id = match lang {
-        nyx_scanner::symbol::Lang::Python => "python-3",
-        nyx_scanner::symbol::Lang::JavaScript | nyx_scanner::symbol::Lang::TypeScript => "node-20",
-        _ => "unknown",
-    };
+    let toolchain_id = nyx_scanner::dynamic::spec::default_toolchain_id(lang);
 
     let spec = HarnessSpec {
         finding_id: "0000000000000001".into(),