diff --git a/.gitignore b/.gitignore
index 0526cc2..7034578 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,9 +1,3 @@
 /*/target/
 /target/
 core/src/main/java/com/threerings/getdown/data/Build.java
-
-# IntelliJ IDEA
-.idea/
-*.iml
-*.ipr
-*.iws
diff --git a/core/src/main/java/com/threerings/getdown/data/Application.java b/core/src/main/java/com/threerings/getdown/data/Application.java
index 6e45757..75f23b0 100644
--- a/core/src/main/java/com/threerings/getdown/data/Application.java
+++ b/core/src/main/java/com/threerings/getdown/data/Application.java
@@ -32,7 +32,8 @@ import static com.threerings.getdown.Log.log;
 import static java.nio.charset.StandardCharsets.UTF_8;
 
 /**
- * Parses and provide access to the information contained in the {@code getdown.txt} configuration file.
+ * Parses and provide access to the information contained in the <code>getdown.txt</code>
+ * configuration file.
  */
 public class Application
 {
@@ -449,7 +450,9 @@ public class Application
             return null;
         }
 
-        String vmfile = _javaLocalDir.getName() + ".jar";
+        // take extension from java location
+        String vmfileExt = _javaLocation.substring(_javaLocation.lastIndexOf('.'));
+        String vmfile = _javaLocalDir.getName() + vmfileExt;
         try {
             URL remote = new URL(createVAppBase(_targetVersion), encodePath(_javaLocation));
             return new Resource(vmfile, remote, getLocalPath(vmfile),
@@ -874,7 +877,7 @@ public class Application
     }
 
     /**
-     * Attempts to redownload the {@code getdown.txt} file based on information parsed from a
+     * Attempts to redownload the <code>getdown.txt</code> file based on information parsed from a
      * previous call to {@link #init}.
      */
     public void attemptRecovery (StatusDisplay status)
@@ -885,7 +888,7 @@ public class Application
     }
 
     /**
-     * Downloads and replaces the {@code getdown.txt} and {@code digest.txt} files with
+     * Downloads and replaces the <code>getdown.txt</code> and <code>digest.txt</code> files with
      * those for the target version of our application.
      */
     public void updateMetadata ()
@@ -932,7 +935,7 @@ public class Application
     public Process createProcess (boolean optimum)
         throws IOException
     {
-        List<String> args = new ArrayList<>();
+        ArrayList<String> args = new ArrayList<>();
 
         // reconstruct the path to the JVM
         args.add(LaunchUtil.getJVMBinaryPath(_javaLocalDir, _windebug || optimum));
@@ -1132,8 +1135,8 @@ public class Application
     }
 
     /**
-     * Loads the {@code digest.txt} file and verifies the contents of both that file and the
-     * {@code getdown.text} file. Then it loads the {@code version.txt} and decides
+     * Loads the <code>digest.txt</code> file and verifies the contents of both that file and the
+     * <code>getdown.text</code> file. Then it loads the <code>version.txt</code> and decides
      * whether or not the application needs to be updated or whether we can proceed to verification
      * and execution.
      *
@@ -1552,6 +1555,7 @@ public class Application
 
                         if (!sig.verify(Base64.decode(signature, Base64.DEFAULT))) {
                             log.info("Signature does not match", "cert", cert.getPublicKey());
+                            continue;
                         } else {
                             log.info("Signature matches", "cert", cert.getPublicKey());
                             validated++;
diff --git a/core/src/main/java/com/threerings/getdown/util/Config.java b/core/src/main/java/com/threerings/getdown/util/Config.java
index 94588aa..4fc5e16 100644
--- a/core/src/main/java/com/threerings/getdown/util/Config.java
+++ b/core/src/main/java/com/threerings/getdown/util/Config.java
@@ -237,7 +237,7 @@ public class Config
      */
     public String getString (String name, String def) {
         String value = (String)_data.get(name);
-        return StringUtil.isBlank(value) ? def : value;
+        return value == null ? def : value;
     }
 
     /**
diff --git a/core/src/main/java/com/threerings/getdown/util/LaunchUtil.java b/core/src/main/java/com/threerings/getdown/util/LaunchUtil.java
index 99cc702..0c33c29 100644
--- a/core/src/main/java/com/threerings/getdown/util/LaunchUtil.java
+++ b/core/src/main/java/com/threerings/getdown/util/LaunchUtil.java
@@ -17,19 +17,19 @@ import static com.threerings.getdown.Log.log;
  * Useful routines for launching Java applications from within other Java
  * applications.
  */
-public final class LaunchUtil
+public class LaunchUtil
 {
     /** The default directory into which a local VM installation should be unpacked. */
     public static final String LOCAL_JAVA_DIR = "java_vm";
 
     /**
-     * Writes a {@code version.txt} file into the specified application directory and
+     * Writes a <code>version.txt</code> file into the specified application directory and
      * attempts to relaunch Getdown in that directory which will cause it to upgrade to the newly
      * specified version and relaunch the application.
      *
      * @param appdir the directory in which the application is installed.
      * @param getdownJarName the name of the getdown jar file in the application directory. This is
-     * probably {@code getdown-pro.jar} or <code>getdown-retro-pro.jar</code> if you are using
+     * probably <code>getdown-pro.jar</code> or <code>getdown-retro-pro.jar</code> if you are using
      * the results of the standard build.
      * @param newVersion the new version to which Getdown will update when it is executed.
      * @param javaLocalDir JRE location within appdir, falls back to {@link #LOCAL_JAVA_DIR} in case if null is passed
@@ -40,7 +40,7 @@ public final class LaunchUtil
      * after making this call as it will be upgraded and restarted. If false is returned, the
      * application should tell the user that they must restart the application manually.
      *
-     * @exception IOException thrown if we were unable to create the {@code version.txt} file
+     * @exception IOException thrown if we were unable to create the <code>version.txt</code> file
      * in the supplied application directory. If the version.txt file cannot be created, restarting
      * Getdown will not cause the application to be upgraded, so the application will have to
      * resort to telling the user that it is in a bad way.
@@ -64,9 +64,7 @@ public final class LaunchUtil
         // do the deed
         String[] args = {
             getJVMBinaryPath(new File(appdir, StringUtil.isBlank(javaLocalDir) ? LOCAL_JAVA_DIR : javaLocalDir), false),
-            "-jar",
-            pro.toString(),
-            appdir.getPath()
+            "-jar", pro.toString(), appdir.getPath()
         };
         log.info("Running " + StringUtil.join(args, "\n  "));
         try {
@@ -146,7 +144,8 @@ public final class LaunchUtil
             if (newgd.renameTo(curgd)) {
                 FileUtil.deleteHarder(oldgd); // yay!
                 try {
-                    // copy the moved file back to newgd so that we don't end up downloading another copy next time
+                    // copy the moved file back to newgd so that we don't end up
+                    // downloading another copy next time
                     FileUtil.copy(curgd, newgd);
                 } catch (IOException e) {
                     log.warning("Error copying updated Getdown back: " + e);
@@ -177,23 +176,23 @@ public final class LaunchUtil
     public static boolean mustMonitorChildren ()
     {
         String osname = System.getProperty("os.name", "").toLowerCase(Locale.ROOT);
-        return osname.contains("windows 98") || osname.contains("windows me");
+        return (osname.indexOf("windows 98") != -1 || osname.indexOf("windows me") != -1);
     }
 
     /**
      * Returns true if we're running in a JVM that identifies its operating system as Windows.
      */
-    public static boolean isWindows () { return _isWindows; }
+    public static final boolean isWindows () { return _isWindows; }
 
     /**
      * Returns true if we're running in a JVM that identifies its operating system as MacOS.
      */
-    public static boolean isMacOS () { return _isMacOS; }
+    public static final boolean isMacOS () { return _isMacOS; }
 
     /**
      * Returns true if we're running in a JVM that identifies its operating system as Linux.
      */
-    public static boolean isLinux () { return _isLinux; }
+    public static final boolean isLinux () { return _isLinux; }
 
     /**
      * Checks whether a Java Virtual Machine can be located in the supplied path.
@@ -231,10 +230,11 @@ public final class LaunchUtil
     static {
         try {
             String osname = System.getProperty("os.name");
-            osname = osname == null ? "" : osname;
-            _isWindows = osname.contains("Windows");
-            _isMacOS = osname.contains("Mac OS") || osname.contains("MacOS");
-            _isLinux = osname.contains("Linux");
+            osname = (osname == null) ? "" : osname;
+            _isWindows = (osname.indexOf("Windows") != -1);
+            _isMacOS = (osname.indexOf("Mac OS") != -1 ||
+                        osname.indexOf("MacOS") != -1);
+            _isLinux = (osname.indexOf("Linux") != -1);
         } catch (Exception e) {
             // can't grab system properties; we'll just pretend we're not on any of these OSes
         }
diff --git a/launcher/src/main/java/com/threerings/getdown/launcher/Getdown.java b/launcher/src/main/java/com/threerings/getdown/launcher/Getdown.java
index 4ae0f80..d5be7b3 100644
--- a/launcher/src/main/java/com/threerings/getdown/launcher/Getdown.java
+++ b/launcher/src/main/java/com/threerings/getdown/launcher/Getdown.java
@@ -75,7 +75,7 @@ public abstract class Getdown extends Thread
             // welcome to hell, where java can't cope with a classpath that contains jars that live
             // in a directory that contains a !, at least the same bug happens on all platforms
             String dir = envc.appDir.toString();
-            if (".".equals(dir)) {
+            if (dir.equals(".")) {
                 dir = System.getProperty("user.dir");
             }
             String errmsg = "The directory in which this application is installed:\n" + dir +
@@ -130,7 +130,7 @@ public abstract class Getdown extends Thread
         File instdir = _app.getLocalPath("");
         if (!instdir.canWrite()) {
             String path = instdir.getPath();
-            if (".".equals(path)) {
+            if (path.equals(".")) {
                 path = System.getProperty("user.dir");
             }
             fail(MessageUtil.tcompose("m.readonly_error", path));
@@ -824,7 +824,7 @@ public abstract class Getdown extends Thread
     }
 
     /**
-     * Update the status to indicate getdown has failed for the reason in {@code message}.
+     * Update the status to indicate getdown has failed for the reason in <code>message</code>.
      */
     protected void fail (String message)
     {