The value for annotation attribute Array.value must be a constant

[igler]

When generating Java code through 'mvn com.nativelibs4java:maven-jnaerator-plugin:generate' the generated Java-code looks like this:

@array({(int)de.test.MyLibrary.tipmon_sizes.TIP_GDA_DATA_LENGTH.value()})

Java compiler complains with the error:

"The value for annotation attribute Array.value must be a constant"

How can I solve the issue? The Java version I use is jdk1.7.0_09

[ochafik]

Hi @igler ,

Thanks for your report!
Could you please reproduce a self-sufficient C source snippet which leads to such generated code?

Using the freshly-released version 0.11 of JNAerator on the following snippet, things appear to work:

const int LEN1 = 10;
#define LEN2 20
struct S {
    int a[LEN1];
    int b[LEN2];
};

Cheers

[igler]

Hi,

I use the following maven plugins:

com.nativelibs4java bridj 0.6.1 com.nativelibs4java maven-jnaerator-plugin 0.10 maven-plugin

Who is uploading recent version of 'maven-jnaerator-plugin' to maven repository?

The C-code that causes the warning/error looks like:

...
enum tipmon_sizes
{
...
TIP_ITEMID_LENGTH = 31,
...
};
...
struct
{
...
wschar_t progid[TIP_ITEMID_LENGTH];
...
} sys;
...

The generated Java code is:
...
/// C type : wschar_t[TIP_ITEMID_LENGTH]
@array({(int)de.test.MLibrary.tipmon_sizes.TIP_ITEMID_LENGTH.value()})
@field(4)
public Pointer progid() {
return this.io.getPointerField(this, 4);
}
...

[ochafik]

Hi @igler ,

Thanks for these details!
The way enum items are handled right now doesn't play well with constant expressions in Java, indeed...
Will try and address this asap :-)

Oh, and JNAerator 0.11 & BridJ 0.6.2 have just been synced to Maven Central (they still exhibit the same issue but bring along tons of other fixes, please give them a try :-)).

Cheers

[igler]

Thanx for the info. Using them henceforth.

... but the annotation-error persists. A soon fix would be nice :-)

[ochafik]

As a temporary workaround, you can try defining that item as a constant with -DTIP_ITEMID_LENGTH=31

[igler]

Tried 'mvn -DTIP_ITEMID_LENGTH=31 com.nativelibs4java:maven-jnaerator-plugin:generate' but the generated code is not different.

[ochafik]

Hi @igler,

This argument needs to be passed to JNAerator using its configuration file (Maven's -D argument defines a system property, which is not what we want here).
You can simply add it to your src/main/jnaerator/config.jnaerator file :-)

Cheers

[igler]

Well, added it to config.jnaerator but then I get additional errors. The callback functions I added to my C-header are not generated any more.

The config:
-DTIP_ITEMID_LENGTH=31
-f
-library MYLIB
-mode Directory
-package myPackage.MYLIB
/path/to/header/tipmon.h

[ochafik]

Hi @igler ,

Sorry for the long delay, this should be fixed in the latest 0.12-SNAPSHOT.
Cheers