extended java & isolate logging, java fix, local test fix

src/LiquidCode.Tester.Worker/Services/Isolate/IsolateService.cs

@@ -163,12 +163,16 @@ public class IsolateService
 
         if (!string.IsNullOrEmpty(options.StdoutFile))
         {
-            args.Add($"--stdout={MapSandboxPath(options.StdoutFile, options.BoxId)}");
+            var mappedStdout = MapSandboxPath(options.StdoutFile, options.BoxId);
+            _logger.LogDebug("Stdout mapping: {Original} -> {Mapped}", options.StdoutFile, mappedStdout);
+            args.Add($"--stdout={mappedStdout}");
         }
 
         if (!string.IsNullOrEmpty(options.StderrFile))
         {
-            args.Add($"--stderr={MapSandboxPath(options.StderrFile, options.BoxId)}");
+            var mappedStderr = MapSandboxPath(options.StderrFile, options.BoxId);
+            _logger.LogDebug("Stderr mapping: {Original} -> {Mapped}", options.StderrFile, mappedStderr);
+            args.Add($"--stderr={mappedStderr}");
         }
 
         // Working directory

src/LiquidCode.Tester.Worker/Services/JavaCompilationServiceIsolate.cs

@@ -1,3 +1,5 @@
+using System.Collections.Generic;
+using System.Text.RegularExpressions;
 using LiquidCode.Tester.Worker.Services.Isolate;
 using LiquidCode.Tester.Worker.Models;
 
@@ -30,16 +32,18 @@ public class JavaCompilationServiceIsolate : ICompilationService
 
     public async Task<CompilationResult> CompileAsync(string sourceCode, string workingDirectory, string? version = null)
     {
-        var sourceFilePath = Path.Combine(workingDirectory, "Solution.java");
+        // Extract class name from source code
-        var classFilePath = Path.Combine(workingDirectory, "Solution.class");
+        var className = ExtractPublicClassName(sourceCode) ?? "Solution";
+        var sourceFilePath = Path.Combine(workingDirectory, $"{className}.java");
+        var classFilePath = Path.Combine(workingDirectory, $"{className}.class");
 
-        _logger.LogInformation("Compiling Java code with Isolate in {WorkingDirectory} with version {Version}",
+        _logger.LogInformation("Compiling Java code with Isolate in {WorkingDirectory} with version {Version}, class: {ClassName}",
-            workingDirectory, version ?? "latest");
+            workingDirectory, version ?? "latest", className);
 
         try
         {
             await File.WriteAllTextAsync(sourceFilePath, sourceCode);
-            return await CompileFileInIsolateAsync(sourceFilePath, classFilePath, workingDirectory, version);
+            return await CompileFileInIsolateAsync(sourceFilePath, classFilePath, workingDirectory, version, className);
         }
         catch (Exception ex)
         {
@@ -52,11 +56,22 @@ public class JavaCompilationServiceIsolate : ICompilationService
         }
     }
 
+    /// <summary>
+    /// Extract public class name from Java source code
+    /// </summary>
+    private static string? ExtractPublicClassName(string sourceCode)
+    {
+        // Match "public class ClassName" (with optional generics, extends, implements)
+        var match = Regex.Match(sourceCode, @"public\s+class\s+(\w+)");
+        return match.Success ? match.Groups[1].Value : null;
+    }
+
     private async Task<CompilationResult> CompileFileInIsolateAsync(
         string sourceFilePath,
         string classFilePath,
         string workingDirectory,
-        string? version = null)
+        string? version = null,
+        string className = "Solution")
     {
         int boxId = -1;
 
@@ -87,6 +102,13 @@ public class JavaCompilationServiceIsolate : ICompilationService
             var stderrFilePath = Path.Combine(boxDir, "compile_stderr.txt");
             var stdoutFilePath = Path.Combine(boxDir, "compile_stdout.txt");
 
+            // Create empty files for stdout/stderr (isolate might require them to exist)
+            await File.WriteAllTextAsync(stdoutFilePath, string.Empty);
+            await File.WriteAllTextAsync(stderrFilePath, string.Empty);
+
+            _logger.LogDebug("Stdout will be written to: {StdoutPath}", stdoutFilePath);
+            _logger.LogDebug("Stderr will be written to: {StderrPath}", stderrFilePath);
+
             var isolateResult = await _isolateService.RunAsync(new IsolateRunOptions
             {
                 BoxId = boxId,
@@ -103,11 +125,16 @@ public class JavaCompilationServiceIsolate : ICompilationService
                 WorkingDirectory = "/box",
                 DirectoryBindings = new List<DirectoryBinding>
                 {
-                    new DirectoryBinding { HostPath = "/usr/bin", SandboxPath = "/usr/bin", ReadOnly = true },
                     new DirectoryBinding { HostPath = "/usr/lib", SandboxPath = "/usr/lib", ReadOnly = true },
                     new DirectoryBinding { HostPath = "/lib", SandboxPath = "/lib", ReadOnly = true },
                     new DirectoryBinding { HostPath = "/lib64", SandboxPath = "/lib64", ReadOnly = true },
+                    new DirectoryBinding { HostPath = "/usr/bin", SandboxPath = "/usr/bin", ReadOnly = true },
+                    new DirectoryBinding { HostPath = "/bin", SandboxPath = "/bin", ReadOnly = true },
                     new DirectoryBinding { HostPath = "/etc", SandboxPath = "/etc", ReadOnly = true }
+                },
+                EnvironmentVariables = new Dictionary<string, string>
+                {
+                    ["PATH"] = "/usr/local/bin:/usr/bin:/bin"
                 }
             });
 
@@ -122,6 +149,14 @@ public class JavaCompilationServiceIsolate : ICompilationService
                     compilerOutput = stdoutContent;
                     _logger.LogDebug("Read stdout file: {Length} bytes", stdoutContent.Length);
                 }
+                else
+                {
+                    _logger.LogDebug("Stdout file exists but is empty");
+                }
+            }
+            else
+            {
+                _logger.LogWarning("Stdout file does not exist at {Path}", stdoutFilePath);
             }
 
             // Read stderr
@@ -135,6 +170,14 @@ public class JavaCompilationServiceIsolate : ICompilationService
                         : $"{compilerOutput}\n{stderrContent}";
                     _logger.LogDebug("Read stderr file: {Length} bytes", stderrContent.Length);
                 }
+                else
+                {
+                    _logger.LogDebug("Stderr file exists but is empty");
+                }
+            }
+            else
+            {
+                _logger.LogWarning("Stderr file does not exist at {Path}", stderrFilePath);
             }
 
             if (!string.IsNullOrEmpty(isolateResult.ErrorOutput))
@@ -169,7 +212,7 @@ public class JavaCompilationServiceIsolate : ICompilationService
             }
 
             // Copy .class file back
-            var boxClassPath = Path.Combine(boxDir, "Solution.class");
+            var boxClassPath = Path.Combine(boxDir, $"{className}.class");
             if (isolateResult.ExitCode == 0 && File.Exists(boxClassPath))
             {
                 Directory.CreateDirectory(Path.GetDirectoryName(classFilePath)!);
@@ -184,8 +227,8 @@ public class JavaCompilationServiceIsolate : ICompilationService
                 };
             }
 
-            _logger.LogWarning("Java compilation failed with exit code {ExitCode} in box {BoxId}",
+            _logger.LogWarning("Java compilation failed with exit code {ExitCode} in box {BoxId}. Compiler output: {Output}",
-                isolateResult.ExitCode, boxId);
+                isolateResult.ExitCode, boxId, compilerOutput);
             return new CompilationResult
             {
                 Success = false,

src/LiquidCode.Tester.Worker/Services/JavaExecutionServiceIsolate.cs

@@ -73,11 +73,14 @@ public class JavaExecutionServiceIsolate : IExecutionService
             var jvmHeapMb = memoryLimitMb;
             var jvmTotalMemoryMb = memoryLimitMb + 64; // Add 64MB for JVM overhead (metaspace, code cache, etc.)
 
+            // Extract class name from .class file path
+            var className = Path.GetFileNameWithoutExtension(executablePath);
+
             var arguments = new List<string>
             {
                 $"-Xmx{jvmHeapMb}m",  // Max heap size = requested memory limit
                 $"-Xms{Math.Min(jvmHeapMb, 32)}m",  // Initial heap size (min 32MB or requested)
-                "-cp", "/box", "Solution"
+                "-cp", "/box", className
             };
 
             var isolateResult = await _isolateService.RunAsync(new IsolateRunOptions