invalid java env var

unified_sheepit_launcher.ps1

@@ -87,11 +87,62 @@ try {
     }
 
     Write-Host "Starting SheepIt client..." -ForegroundColor Cyan
-${userLine}    Set-Location `$sheepDir
-    & java -jar `$jarPath -ui text --log-stdout --verbose -gpu OPTIX_0 -login '${safeUser}' -password '${safeKey}'
+    
+    # Check and fix problematic environment variables that can cause boot class path errors
+    `$envVarsFixed = `$false
+    
+    # Check JAVA_HOME - invalid values like '\' or empty can cause issues
+    if (`$env:JAVA_HOME) {
+        if (`$env:JAVA_HOME -eq '\' -or `$env:JAVA_HOME.Trim() -eq '' -or -not (Test-Path `$env:JAVA_HOME)) {
+            Write-Host "Warning: Invalid JAVA_HOME detected ('`$env:JAVA_HOME'). Temporarily unsetting..." -ForegroundColor Yellow
+            Remove-Item Env:\JAVA_HOME -ErrorAction SilentlyContinue
+            `$envVarsFixed = `$true
+        }
+    }
+    
+    # Check JAVA_TOOL_OPTIONS - invalid values can cause boot class path errors
+    if (`$env:JAVA_TOOL_OPTIONS) {
+        if (`$env:JAVA_TOOL_OPTIONS -eq '\' -or `$env:JAVA_TOOL_OPTIONS.Trim() -eq '') {
+            Write-Host "Warning: Invalid JAVA_TOOL_OPTIONS detected ('`$env:JAVA_TOOL_OPTIONS'). Temporarily unsetting..." -ForegroundColor Yellow
+            Remove-Item Env:\JAVA_TOOL_OPTIONS -ErrorAction SilentlyContinue
+            `$envVarsFixed = `$true
+        }
+    }
+    
+    if (`$envVarsFixed) {
+        Write-Host "Environment variables fixed. Proceeding with Java launch..." -ForegroundColor Green
+    }
+    
+    # Check Java version
+    try {
+        `$javaOutput = java -version 2>&1
+        `$javaVersion = `$javaOutput | Select-Object -First 1
+        Write-Host "Java version: `$javaVersion" -ForegroundColor Gray
+    }
+    catch {
+        Write-Host "Warning: Could not determine Java version" -ForegroundColor Yellow
+    }
+    
+    Set-Location `$sheepDir
+    
+    # Use -XX:+IgnoreUnrecognizedVMOptions to handle any incompatible JVM args
+    # This flag helps with Java 9+ compatibility issues
+    `$javaArgs = @('-XX:+IgnoreUnrecognizedVMOptions', '-jar', `$jarPath, 
+                   '-ui', 'text', '--log-stdout', '--verbose', 
+                   '-gpu', 'OPTIX_0', '-login', '${safeUser}', '-password', '${safeKey}')
+    
+    try {
+        & java @javaArgs
+    }
+    catch {
+        Write-Host ('Java execution error: {0}' -f `$_.Exception.Message) -ForegroundColor Red
+        Write-Host "If the error persists, try reinstalling Java (Temurin 21 recommended)." -ForegroundColor Yellow
+        throw
+    }
 }
 catch {
     Write-Host ('Error: {0}' -f `$_.Exception.Message) -ForegroundColor Red
+    Write-Host ('Stack trace: {0}' -f `$_.ScriptStackTrace) -ForegroundColor DarkRed
 }
 "@
 }