feat: support for Java.NumberFormatException

error_templates/java/number_format_exception.go

@@ -0,0 +1,54 @@
+package java
+
+import (
+	"context"
+
+	lib "github.com/nedpals/errgoengine"
+)
+
+var NumberFormatException = lib.ErrorTemplate{
+	Name:    "NumberFormatException",
+	Pattern: runtimeErrorPattern("java.lang.NumberFormatException", "For input string: \"(?P<string>.+)\""),
+	OnAnalyzeErrorFn: func(cd *lib.ContextData, m *lib.MainError) {
+		for q := m.Document.RootNode().Query(`(method_invocation name: (identifier) @name arguments: (argument_list (_) @arg) (#eq? @name "parseInt") (#any-eq? @arg "%s"))`, cd.Variables["string"]); q.Next(); {
+			if q.CurrentTagName() != "arg" {
+				continue
+			}
+			node := q.CurrentNode()
+			m.Nearest = node
+			break
+		}
+	},
+	OnGenExplainFn: func(cd *lib.ContextData, gen *lib.ExplainGenerator) {
+		gen.Add("This error occurs when there is an attempt to convert a string to a numeric type, but the string does not represent a valid number.")
+	},
+	OnGenBugFixFn: func(cd *lib.ContextData, gen *lib.BugFixGenerator) {
+		gen.Add("Ensure valid input for parsing", func(s *lib.BugFixSuggestion) {
+			if cd.MainError.Nearest.Type() == "identifier" {
+				variableSym := cd.Analyzer.AnalyzeNode(context.TODO(), cd.MainError.Nearest)
+
+				if variableSym != nil {
+					varNode := cd.MainError.Document.RootNode().NamedDescendantForPointRange(
+						variableSym.Location(),
+					)
+
+					if varNode.Type() != "variable_declarator" {
+						return
+					}
+
+					valueNode := varNode.ChildByFieldName("value")
+					if valueNode.Type() != "string_literal" {
+						return
+					}
+
+					s.AddStep("Make sure the string contains a valid numeric representation before attempting to parse it.").
+						AddFix(lib.FixSuggestion{
+							NewText:       "123",
+							StartPosition: varNode.ChildByFieldName("value").StartPosition().Add(lib.Position{Column: 1}),
+							EndPosition:   varNode.ChildByFieldName("value").EndPosition().Add(lib.Position{Column: -1}),
+						})
+				}
+			}
+		})
+	},
+}

error_templates/java/test_files/number_format_exception/Main.java

@@ -0,0 +1,6 @@
+public class Main {
+    public static void main(String[] args) {
+        String invalidNumber = "abc";
+        int result = Integer.parseInt(invalidNumber);
+    }
+}

error_templates/java/test_files/number_format_exception/test.txt

@@ -0,0 +1,30 @@
+template: "Java.NumberFormatException"
+---
+Exception in thread "main" java.lang.NumberFormatException: For input string: "abc"
+	at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:67)
+	at java.base/java.lang.Integer.parseInt(Integer.java:661)
+	at java.base/java.lang.Integer.parseInt(Integer.java:777)
+	at Main.main(Main.java:5)
+===
+template: "Java.NumberFormatException"
+---
+# NumberFormatException
+This error occurs when there is an attempt to convert a string to a numeric type, but the string does not represent a valid number.
+```
+        String invalidNumber = "abc";
+        int result = Integer.parseInt(invalidNumber);
+                                      ^^^^^^^^^^^^^
+    }
+}
+```
+## Steps to fix
+### Ensure valid input for parsing
+Make sure the string contains a valid numeric representation before attempting to parse it.
+```diff
+public class Main {
+    public static void main(String[] args) {
+-         String invalidNumber = "abc";
++         String invalidNumber = "123";
+        int result = Integer.parseInt(invalidNumber);
+    }
+```