I have the same problem.

Both gt-epsg-hsql and gt-referencing are in my pom.xml:

[INFO] +- org.geotools:gt-epsg-hsql:jar:2.6.4:compile
[INFO] |  \- hsqldb:hsqldb:jar:1.8.0.7:compile
[INFO] +- org.geotools:gt-referencing:jar:2.6.4:compile
[INFO] |  +- java3d:vecmath:jar:1.3.2:compile
[INFO] |  +- commons-pool:commons-pool:jar:1.5.3:compile
[INFO] |  \- org.geotools:gt-metadata:jar:2.6.4:compile
[INFO] |     +- org.opengis:geoapi:jar:2.3-M1:compile
[INFO] |     +- org.opengis:geoapi-pending:jar:2.3-M1:compile
[INFO] |     \- net.java.dev.jsr-275:jsr-275:jar:1.0-beta-2:compile

- If I use the following import:
import org.geotools.referencing.CRS;

- and try to run the line:
CoordinateReferenceSystem crs = CRS.decode("ESPG:4326");

- then I get the error:
Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
        CoordinateReferenceSystem cannot be resolved to a type

- If instead I use:
import org.opengis.referencing.crs.CoordinateReferenceSystem;

- then I get the error:
Exception in thread "main"
org.opengis.referencing.NoSuchAuthorityCodeException: Authority "ESPG" is
unknown or doesn't match the supplied hints. Maybe it is defined in an
unreachable JAR file?
        at
org.geotools.referencing.factory.ManyAuthoritiesFactory.noSuchAuthority(ManyAuthoritiesFactory.java:488)
        at
org.geotools.referencing.factory.ManyAuthoritiesFactory.getAuthorityFactory(ManyAuthoritiesFactory.java:466)
        at
org.geotools.referencing.factory.ManyAuthoritiesFactory.getCRSAuthorityFactory(ManyAuthoritiesFactory.java:547)
        at
org.geotools.referencing.factory.AuthorityFactoryAdapter.createCoordinateReferenceSystem(AuthorityFactoryAdapter.java:798)
        at
org.geotools.referencing.factory.ThreadedAuthorityFactory.createCoordinateReferenceSystem(ThreadedAuthorityFactory.java:729)
        at
org.geotools.referencing.DefaultAuthorityFactory.createCoordinateReferenceSystem(DefaultAuthorityFactory.java:179)
        at org.geotools.referencing.CRS.decode(CRS.java:435)
        at org.geotools.referencing.CRS.decode(CRS.java:363)

Can anyone help?
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