What was the German publics reaction to the Invasion of Poland (September 1st 1939)?

The average German's reaction to the invasion of Poland, France, and the USSR was almost always "oh God, not another war." The cheering crowds of 1914 were nowhere to be seen, and the Gestapo regularly reported reactions between fear and resignment.

Most Germans remembered (or heard their parents tell them of) the massive losses and horrible deprivations of the First World War - they were afraid that their sons and brothers weren't going to come back home, that they would soon face starvation again, and few thought their military was anywhere near as strong as it had been in 1914 (I'd argue that they were right, too, and it was only the monumental incompetence of the French command in 1940 that makes this a minority opinion). There was some elation when France surrendered, with many believing that Germany had now won the war, but as time went on and war began with the USSR, that feeling died.

After the disaster at Kursk and the real beginning of the Allied bomber offensive, a wave of dread fell across Germany, and as a result the German state dramatically ramped up repression, to keep a lid on "defeatism" through use of the guillotine. This defeatism only got worse as time went on, the Soviets got closer, and more cities were bombed.

Basically, the Germans would have been pleased to win a war, but they were never enthusiastic about it and were always highly apprehensive (again, unlike 1914). They, however, were largely resigned to their fate, at least until the Russians got close to home.

Caspian's answer is on target. Even though most Germans accepted the nazi propaganda that the Poles had provoked the war, they were fearful of what war would mean. When England and France declared war, morale dropped even more. Over the next several months, morale began to climb. After England's retreat from the continent and France's defeat, German optimism rose considerably, as people began to believe Hitler really could pull off a miracle. But with Operation Barbarossa, the German people once more began to fear for the future. A fear that was well justified, as it turns out.

The greatest military machine since the Roman Legions had almost won WW2 in Africa.....the glorious Afrika Korps was next to none in leadership, with the best troops in the world achieving almost complete domination of the middle east oil supplies. If and only if the USSR had been left alone and not attacked, the Germans would have destroyed any and all forces threatening their positions.