ADT error with comodo code signing certificate

Hello,

I'm trying to sign an AIR app with a Comodo code signing cert.

- SHA-256 with RSA Encryption

- Java 1.8 (same problem with 1.6)

- AIR 15 (same problem with older versions)

My command :

java -jar -Xmx1024m /data/sdk/AIRSDK_Compiler15/lib/adt.jar  -sign -storetype pkcs12 -storepass ******* -keystore cert/air-distrib.p12 bin-release/TestCert.airi bin-release/TestCert.air

I get the following error :

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
    at java.util.Arrays.copyOf(Arrays.java:3181)
    at java.util.ArrayList.grow(ArrayList.java:261)
    at java.util.ArrayList.ensureExplicitCapacity(ArrayList.java:235)
    at java.util.ArrayList.ensureCapacityInternal(ArrayList.java:227)
    at java.util.ArrayList.add(ArrayList.java:458)
    at sun.security.pkcs12.PKCS12KeyStore.engineLoad(PKCS12KeyStore.java:2026)
    at java.security.KeyStore.load(KeyStore.java:1433)
    at com.adobe.ucf.UCF.processSigningOptions(UCF.java:313)
    at com.adobe.ucf.UCF.parseSigningOptions(UCF.java:298)
    at com.adobe.air.ADT.parseSign(ADT.java:1589)
    at com.adobe.air.ADT.parseArgsAndGo(ADT.java:598)
    at com.adobe.air.ADT.run(ADT.java:435)
    at com.adobe.air.ADT.main(ADT.java:485)

When i increase java memory at 8go, java uses 6go and don't stop... (nothing after 20 minutes...)

Any idea ?

ADT or cert problem ? Other ?

Thx.

Jonas