Don't resolve configurations in config phase.

src/main/groovy/com/github/jengelman/gradle/plugins/shadow/internal/DependencyFileCollection.java

@@ -0,0 +1,29 @@
+package com.github.jengelman.gradle.plugins.shadow.internal;
+
+import org.gradle.api.artifacts.Configuration;
+import org.gradle.api.internal.file.AbstractFileCollection;
+
+import java.io.File;
+import java.util.List;
+import java.util.Set;
+
+public class DependencyFileCollection extends AbstractFileCollection {
+
+    private final DependencyFilter filter;
+    private final List<Configuration> configurations;
+
+    public DependencyFileCollection(DependencyFilter filter, List<Configuration> configurations) {
+        this.filter = filter;
+        this.configurations = configurations;
+    }
+
+    @Override
+    public String getDisplayName() {
+        return "Shadow Dependencies to Merge";
+    }
+
+    @Override
+    public Set<File> getFiles() {
+        return filter.resolve(configurations).getFiles();
+    }
+}

src/main/groovy/com/github/jengelman/gradle/plugins/shadow/tasks/ShadowJar.java

@@ -1,10 +1,7 @@
 package com.github.jengelman.gradle.plugins.shadow.tasks;
 
 import com.github.jengelman.gradle.plugins.shadow.ShadowStats;
-import com.github.jengelman.gradle.plugins.shadow.internal.DefaultDependencyFilter;
-import com.github.jengelman.gradle.plugins.shadow.internal.DependencyFilter;
-import com.github.jengelman.gradle.plugins.shadow.internal.GradleVersionUtil;
-import com.github.jengelman.gradle.plugins.shadow.internal.ZipCompressor;
+import com.github.jengelman.gradle.plugins.shadow.internal.*;
 import com.github.jengelman.gradle.plugins.shadow.relocation.Relocator;
 import com.github.jengelman.gradle.plugins.shadow.relocation.SimpleRelocator;
 import com.github.jengelman.gradle.plugins.shadow.transformers.AppendingTransformer;
@@ -19,7 +16,6 @@
 import org.gradle.api.internal.DocumentationRegistry;
 import org.gradle.api.internal.file.FileResolver;
 import org.gradle.api.internal.file.copy.CopyAction;
-import org.gradle.api.java.archives.Manifest;
 import org.gradle.api.tasks.InputFiles;
 import org.gradle.api.tasks.Optional;
 import org.gradle.api.tasks.TaskAction;
@@ -73,7 +69,7 @@ protected void copy() {
 
     @InputFiles @Optional
     public FileCollection getIncludedDependencies() {
-        return dependencyFilter.resolve(configurations);
+        return new DependencyFileCollection(dependencyFilter, configurations);
     }
 
     /**

src/main/resources/shadow-version.txt

@@ -1 +1 @@
-1.2.3
+1.3.0-SNAPSHOT