The German government first refused to sign the treaty and the Allies soon threatened Germany with war. This led to a formation of a new government which reluctantly signed the treaty. The cost of a second war for Germany would be suicidal. Once the treaty had been signed, many promised to do call they could to overthrow it.
The 'Stab in the Back' myth.
The new government was severely weakened by the terms of the treaty. Many Germans still didn't believe that Germany had lost the war. Famous leaders like Ludendorff encouraged people to still believe this view. This myth soon turned to be powerful and many believed that the German army had been stabbed in the back by the government. Right-winged parties took this opportunity to make the government look worse and exercised this belief. This brought great bitterness towards the new-found democracy.
The aftermath of the Treaty - the Kapp Putsch
Many Germans resented the Treaty which posed a great threat to the overall stability of the new government. The army were the most important group which were unhappy with the Treaty. The restrictions in the terms of the treaty were hated and they blamed the government for having consented to them. Many soldiers who were demobbed joined the Freikorps. The Allies by 1920 were getting unsettled by the unofficial forces who were enlarging in size. Pressure from the Allies was on the German government to disband them. When the government attempted this in March 1920, Wolfgang Kapp led the Freikorps to march into Berlin and declared a new government. The army did not stop them and Ebert's government were forced to flee to Dresden. Politicians knew that they wouldn't be saved by the army and looked for the workers for help. The workers went on strike and it was this great general strike that collapsed the Kapp Putsch within 4 days. Ebert's government was restored however, the participators of the putsch were never sanctioned.