fix memory limiting java & kotlin

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

@@ -14,7 +14,7 @@ public class JavaCompilationServiceIsolate : ICompilationService
     private readonly IsolateBoxPool _boxPool;
 
     private const int CompilationTimeLimitSeconds = 30;
-    private const int CompilationMemoryLimitMb = 512;
+    private const int CompilationMemoryLimitMb = 1024; // JVM needs more memory
 
     public JavaCompilationServiceIsolate(
         ILogger<JavaCompilationServiceIsolate> logger,
@@ -85,6 +85,7 @@ public class JavaCompilationServiceIsolate : ICompilationService
             arguments.Add($"/box/{sourceFileName}");
 
             var stderrFilePath = Path.Combine(boxDir, "compile_stderr.txt");
+            var stdoutFilePath = Path.Combine(boxDir, "compile_stdout.txt");
 
             var isolateResult = await _isolateService.RunAsync(new IsolateRunOptions
             {
@@ -94,28 +95,57 @@ public class JavaCompilationServiceIsolate : ICompilationService
                 TimeLimitSeconds = CompilationTimeLimitSeconds,
                 WallTimeLimitSeconds = CompilationTimeLimitSeconds * 2,
                 MemoryLimitKb = CompilationMemoryLimitMb * 1024,
-                StackLimitKb = 256 * 1024,
-                ProcessLimit = 10, // javac may spawn multiple processes
+                StackLimitKb = 128 * 1024, // 128MB stack per process
+                ProcessLimit = 64, // JVM needs many threads/processes
                 EnableNetwork = false,
+                StdoutFile = stdoutFilePath,
                 StderrFile = stderrFilePath,
                 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 = "/lib", SandboxPath = "/lib", ReadOnly = true },
+                    new DirectoryBinding { HostPath = "/lib64", SandboxPath = "/lib64", ReadOnly = true },
+                    new DirectoryBinding { HostPath = "/etc", SandboxPath = "/etc", ReadOnly = true }
                 }
             });
 
             var compilerOutput = string.Empty;
+
+            // Read stdout (javac may output errors there)
+            if (File.Exists(stdoutFilePath))
+            {
+                var stdoutContent = await File.ReadAllTextAsync(stdoutFilePath);
+                if (!string.IsNullOrWhiteSpace(stdoutContent))
+                {
+                    compilerOutput = stdoutContent;
+                    _logger.LogDebug("Read stdout file: {Length} bytes", stdoutContent.Length);
+                }
+            }
+
+            // Read stderr
             if (File.Exists(stderrFilePath))
             {
-                compilerOutput = await File.ReadAllTextAsync(stderrFilePath);
+                var stderrContent = await File.ReadAllTextAsync(stderrFilePath);
+                if (!string.IsNullOrWhiteSpace(stderrContent))
+                {
+                    compilerOutput = string.IsNullOrEmpty(compilerOutput)
+                        ? stderrContent
+                        : $"{compilerOutput}\n{stderrContent}";
+                    _logger.LogDebug("Read stderr file: {Length} bytes", stderrContent.Length);
                 }
+            }
+
             if (!string.IsNullOrEmpty(isolateResult.ErrorOutput))
             {
-                compilerOutput = $"{compilerOutput}\n{isolateResult.ErrorOutput}".Trim();
+                compilerOutput = string.IsNullOrEmpty(compilerOutput)
+                    ? isolateResult.ErrorOutput
+                    : $"{compilerOutput}\n{isolateResult.ErrorOutput}";
             }
 
+            _logger.LogDebug("Final compiler output: {Output}", compilerOutput);
+
             if (isolateResult.TimeLimitExceeded)
             {
                 _logger.LogWarning("Java compilation time limit exceeded for box {BoxId}", boxId);

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

@@ -69,22 +69,39 @@ public class JavaExecutionServiceIsolate : IExecutionService
 
             // Run in Isolate
             // Note: Java needs more memory for JVM overhead
-            var javaMemoryMb = Math.Max(memoryLimitMb, 128); // Minimum 128MB for JVM
+            // We set JVM heap limit to the requested memory, but give Isolate more for JVM internals
+            var jvmHeapMb = memoryLimitMb;
+            var jvmTotalMemoryMb = memoryLimitMb + 64; // Add 64MB for JVM overhead (metaspace, code cache, etc.)
+
+            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"
+            };
 
             var isolateResult = await _isolateService.RunAsync(new IsolateRunOptions
             {
                 BoxId = boxId,
                 Executable = "/usr/bin/java",
-                Arguments = new[] { "-cp", "/box", "Solution" },
+                Arguments = arguments.ToArray(),
                 TimeLimitSeconds = timeLimitMs / 1000.0,
                 WallTimeLimitSeconds = (timeLimitMs / 1000.0) * 2,
-                MemoryLimitKb = javaMemoryMb * 1024,
+                MemoryLimitKb = jvmTotalMemoryMb * 1024,
                 StackLimitKb = 256 * 1024, // 256 MB stack
                 ProcessLimit = 64, // Java creates multiple threads
                 EnableNetwork = false,
                 StdinFile = sandboxInputPath,
                 StdoutFile = outputFilePath,
-                WorkingDirectory = "/box"
+                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 = "/etc", SandboxPath = "/etc", ReadOnly = true }
+                }
             });
 
             stopwatch.Stop();

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

@@ -1,3 +1,4 @@
+using System.Collections.Generic;
 using LiquidCode.Tester.Worker.Services.Isolate;
 using LiquidCode.Tester.Worker.Models;
 
@@ -14,7 +15,7 @@ public class KotlinCompilationServiceIsolate : ICompilationService
     private readonly IsolateBoxPool _boxPool;
 
     private const int CompilationTimeLimitSeconds = 30;
-    private const int CompilationMemoryLimitMb = 512;
+    private const int CompilationMemoryLimitMb = 1024; // Kotlin uses JVM, needs more memory
 
     public KotlinCompilationServiceIsolate(
         ILogger<KotlinCompilationServiceIsolate> logger,
@@ -38,7 +39,21 @@ public class KotlinCompilationServiceIsolate : ICompilationService
 
         try
         {
-            await File.WriteAllTextAsync(sourceFilePath, sourceCode);
+            // Normalize line endings
+            var normalizedSourceCode = sourceCode
+                .Replace("\\r\\n", "\n")  // Handle escaped \r\n (literal text "\\r\\n")
+                .Replace("\\n", "\n")      // Handle escaped \n (literal text "\\n")
+                .Replace("\\r", "\n")      // Handle escaped \r (literal text "\\r")
+                .Replace("\r\n", "\n")     // Handle actual Windows line endings
+                .Replace("\r", "\n");      // Handle actual Mac line endings
+
+            _logger.LogDebug("Source code length: {Length}, normalized length: {NormalizedLength}, line count: {LineCount}",
+                sourceCode.Length, normalizedSourceCode.Length, normalizedSourceCode.Split('\n').Length);
+
+            _logger.LogDebug("First 200 chars of source: {Preview}",
+                normalizedSourceCode.Length > 200 ? normalizedSourceCode.Substring(0, 200) : normalizedSourceCode);
+
+            await File.WriteAllTextAsync(sourceFilePath, normalizedSourceCode);
             return await CompileFileInIsolateAsync(sourceFilePath, jarFilePath, version);
         }
         catch (Exception ex)
@@ -88,6 +103,7 @@ public class KotlinCompilationServiceIsolate : ICompilationService
             arguments.Add($"/box/{jarFileName}");
 
             var stderrFilePath = Path.Combine(boxDir, "compile_stderr.txt");
+            var stdoutFilePath = Path.Combine(boxDir, "compile_stdout.txt");
 
             var isolateResult = await _isolateService.RunAsync(new IsolateRunOptions
             {
@@ -97,27 +113,57 @@ public class KotlinCompilationServiceIsolate : ICompilationService
                 TimeLimitSeconds = CompilationTimeLimitSeconds,
                 WallTimeLimitSeconds = CompilationTimeLimitSeconds * 2,
                 MemoryLimitKb = CompilationMemoryLimitMb * 1024,
-                StackLimitKb = 256 * 1024,
-                ProcessLimit = 10,
+                StackLimitKb = 128 * 1024, // 128MB stack per process
+                ProcessLimit = 64, // Kotlin uses JVM, needs many threads/processes
                 EnableNetwork = false,
+                StdoutFile = stdoutFilePath,
                 StderrFile = stderrFilePath,
                 WorkingDirectory = "/box",
                 DirectoryBindings = new List<DirectoryBinding>
                 {
                     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 },
                     new DirectoryBinding { HostPath = "/opt/kotlinc", SandboxPath = "/opt/kotlinc", ReadOnly = true }
+                },
+                EnvironmentVariables = new Dictionary<string, string>
+                {
+                    ["PATH"] = "/usr/local/bin:/usr/bin:/bin"
                 }
             });
 
             var compilerOutput = string.Empty;
+
+            // Read stdout (kotlinc may output errors there)
+            if (File.Exists(stdoutFilePath))
+            {
+                var stdoutContent = await File.ReadAllTextAsync(stdoutFilePath);
+                if (!string.IsNullOrWhiteSpace(stdoutContent))
+                {
+                    compilerOutput = stdoutContent;
+                }
+            }
+
+            // Read stderr
             if (File.Exists(stderrFilePath))
             {
-                compilerOutput = await File.ReadAllTextAsync(stderrFilePath);
+                var stderrContent = await File.ReadAllTextAsync(stderrFilePath);
+                if (!string.IsNullOrWhiteSpace(stderrContent))
+                {
+                    compilerOutput = string.IsNullOrEmpty(compilerOutput)
+                        ? stderrContent
+                        : $"{compilerOutput}\n{stderrContent}";
                 }
+            }
+
             if (!string.IsNullOrEmpty(isolateResult.ErrorOutput))
             {
-                compilerOutput = $"{compilerOutput}\n{isolateResult.ErrorOutput}".Trim();
+                compilerOutput = string.IsNullOrEmpty(compilerOutput)
+                    ? isolateResult.ErrorOutput
+                    : $"{compilerOutput}\n{isolateResult.ErrorOutput}";
             }
 
             if (isolateResult.TimeLimitExceeded)

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

@@ -1,4 +1,5 @@
 using System.Diagnostics;
+using System.Collections.Generic;
 using LiquidCode.Tester.Worker.Services.Isolate;
 
 namespace LiquidCode.Tester.Worker.Services;
@@ -63,22 +64,44 @@ public class KotlinExecutionServiceIsolate : IExecutionService
             }
 
             // Run in Isolate (Kotlin runs via Java)
-            var kotlinMemoryMb = Math.Max(memoryLimitMb, 128); // Minimum 128MB for JVM
+            // We set JVM heap limit to the requested memory, but give Isolate more for JVM internals
+            var jvmHeapMb = memoryLimitMb;
+            var jvmTotalMemoryMb = memoryLimitMb + 64; // Add 64MB for JVM overhead
+
+            var arguments = new List<string>
+            {
+                $"-Xmx{jvmHeapMb}m",  // Max heap size = requested memory limit
+                $"-Xms{Math.Min(jvmHeapMb, 32)}m",  // Initial heap size
+                "-jar", $"/box/{jarName}"
+            };
 
             var isolateResult = await _isolateService.RunAsync(new IsolateRunOptions
             {
                 BoxId = boxId,
                 Executable = "/usr/bin/java",
-                Arguments = new[] { "-jar", $"/box/{jarName}" },
+                Arguments = arguments.ToArray(),
                 TimeLimitSeconds = timeLimitMs / 1000.0,
                 WallTimeLimitSeconds = (timeLimitMs / 1000.0) * 2,
-                MemoryLimitKb = kotlinMemoryMb * 1024,
+                MemoryLimitKb = jvmTotalMemoryMb * 1024,
                 StackLimitKb = 256 * 1024,
                 ProcessLimit = 64, // JVM creates multiple threads
                 EnableNetwork = false,
                 StdinFile = sandboxInputPath,
                 StdoutFile = outputFilePath,
-                WorkingDirectory = "/box"
+                WorkingDirectory = "/box",
+                DirectoryBindings = new List<DirectoryBinding>
+                {
+                    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"
+                }
             });
 
             stopwatch.Stop();