This website uses cookies for visitor traffic analysis. By using the website, you agree with storing the cookies on your computer.More information

VisionX update release 5.4.3900 is available

VisionX 5.4.3900 is available!

It's a small bugfix release with following improvements:

  • Fixed using server storage in combobox

    It wasn't possible to use a server storage in the data wizard.

  • FilterEditor API improved

    The FilterEditor API change was needed to support new features of Profiles and Filter AddOn. It's now possible to better group And/Or and to disable "expert mode".

The download area already contains links to latest VisionX binaries.

Please report any problems as usual and have fun with VisionX.

Adding new paths for native libraries at runtime in Java

If you want to add some native libraries at runtime, it was tricky with Java 8+:

This was a valid solution:

final Field fldUsrPaths = ClassLoader.class.getDeclaredField("usr_paths");
//get array of paths
final String[] saPath = (String[])fldUsrPaths.get(null);
//check if the path to add is already present
for (String path : saPath)
    if (path.equals(pPath))
//add the new path
final String[] saNewPaths = Arrays.copyOf(saPath, saPath.length + 1);
saNewPaths[saNewPaths.length - 1] = pPath;
fldUsrPaths.set(null, saNewPaths);

Since Java 10+ it's not possible anymore, because of: JDK-8210522
Some details from Stackoverflow

If someone still needs a solution for Java 10+, here it is:

Lookup cl = MethodHandles.privateLookupIn(ClassLoader.class, MethodHandles.lookup());
VarHandle usr_paths = cl.findStaticVarHandle(ClassLoader.class, "usr_paths", String[].class);
String[] path = (String[])usr_paths.get();


usr_paths.set(new String[] {"A", "B"});

This code won't work if you are using Java 8. If you want support for e.g. Java < 10, simply use reflection :)
Sounds simple, but it is not simple.....

Here's a working solution: toPDF project (search for addLibraryPath(String pPath)).

The code in detail:

Class<?> clsMHandles = Class.forName("java.lang.invoke.MethodHandles");
Method mStaticLookup = clsMHandles.getMethod("lookup");
Object oStaticLookup = mStaticLookup.invoke(null);

Method mLookup = clsMHandles.getMethod("privateLookupIn", Class.class, Class.forName("java.lang.invoke.MethodHandles$Lookup"));
Object oLookup = mLookup.invoke(null, ClassLoader.class, oStaticLookup);

Method mFindStatic = oLookup.getClass().getMethod("findStaticVarHandle", Class.class, String.class, Class.class);

Object oVarHandle = mFindStatic.invoke(oLookup, ClassLoader.class, "usr_paths", String[].class);

//MethodHandle mh = MethodHandles.lookup().findVirtual(VarHandle.class, "get", MethodType.methodType(Object.class));

Method mFindVirtual = oStaticLookup.getClass().getMethod("findVirtual", Class.class, String.class, Class.forName("java.lang.invoke.MethodType"));

Class<?> clsMethodType = Class.forName("java.lang.invoke.MethodType");
Method mMethodType = clsMethodType.getMethod("methodType", Class.class);

Object oMethodHandleGet = mFindVirtual.invoke(oStaticLookup, Class.forName("java.lang.invoke.VarHandle"), "get", mMethodType.invoke(null, Object.class));

Method mMethodHandleGet = oMethodHandleGet.getClass().getMethod("invokeWithArguments", Object[].class);

String[] saPath = (String[])mMethodHandleGet.invoke(oMethodHandleGet, new Object[] {new Object[] {oVarHandle}});

//check if the path to add is already present
for (String path : saPath)
    if (path.equals(pPath))

//add the new path
final String[] saNewPaths = Arrays.copyOf(saPath, saPath.length + 1);
saNewPaths[saNewPaths.length - 1] = pPath;

//MethodHandle mh = MethodHandles.lookup().findVirtual(VarHandle.class, "set", MethodType.methodType(Void.class, Object[].class));
//mh.invoke(oVarHandle, new String[] {"GEHT"});

mMethodType = clsMethodType.getMethod("methodType", Class.class, Class.class);

Object oMethodHandleSet = mFindVirtual.invoke(oStaticLookup, Class.forName("java.lang.invoke.VarHandle"), "set", mMethodType.invoke(null, Void.class, Object[].class));

Method mMethodHandleSet = oMethodHandleSet.getClass().getMethod("invokeWithArguments", Object[].class);

mMethodHandleSet.invoke(oMethodHandleSet, new Object[] {new Object[] {oVarHandle, saNewPaths}});

Not simple!!!

Summarized: It's not easy but it's still possible. So.... why are things getting more and more complex?

VisionX 5.4 Update release is available

VisionX 5.4.2450 is available!

It's a small update release with following improvements:

  • MySql database support

    We fixed a problem with app export (from embedded PostgreSql) and re-import into a MySql database. It wasn't possible to configure combobox columns.

  • Popup Menu button click

    Sometimes, a click on the arrow of a popup menu button, didn't show the popup and triggered the button action instead.

  • Screen generation

    A new screen with only one table was generated with an additional "white" panel.

  • Filter AddOn update

    We improved the Filter AddOn and now support And/Or grouping. It's also possible to save and load filter settings.

    Some impressions:

    Filter AddOn

    Filter AddOn

    Load settings

    Load settings

  • Filter Editor API

    We improved our Filter Editor API. It's now possible to define the Full-text Filter column names and also which column names can be filtered in general. It's possible to group filter editors by condition (or, and, ...). This enhancement is relevant for developers.