Land purchase transactions in Indonesia, which often involve customary practices and are governed by law, require a written agreement, such as a Sale and Purchase Agreement (PPJB), to prevent conflicts. The PPJB binds both parties and is subject to civil law. In case of a breach of contract, the agreement may be canceled through the court. A breach of contract accompanied by fraud can result in criminal liability, and the affected party may file a civil lawsuit to annul the transaction. This study aims to (1) examine the legal consequences for the parties following the cancellation of a sale and purchase agreement for land rights by the court due to breach of contract; and (2) explore the legal protection available in the cancellation of such agreements in Indonesia. The research method employs a normative legal approach with a literature review, analyzing relevant laws, theories, and court decisions through primary and secondary legal materials. The analysis is qualitative, linking court decisions to the issues addressed in the study. The findings indicate that, in contract law, particularly in land sales, certain principles and conditions govern the validity of agreements. In the event of a breach of contract, the injured party may seek to annul the agreement in court if subjective (agreement, capacity) or objective (valid object and cause) requirements are not met. Cancellation of the agreement restores the parties to their original positions, allowing for the return of any goods exchanged. A breach of contract, where one party fails to fulfill its obligations, may lead to cancellation and compensation. Contract law provides legal protection to the injured party, including the right to demand performance, annulment, and compensation as outlined in the Civil Code.

Cases of dengue fever (DBD) in Solo, including in Gajahan Village, have increased quite significantly. Until the beginning of the year, there were 1,010 cases of DBD recorded throughout Central Java, with 34 cases resulting in death. The purpose of this Community Service Priority problems in this caseconsist of two aspects, including health, law, Health problems include how the community can prevent the spread of Dengue Fever (DBD). While in terms of Law, it discusses community protection related to Aedes Biotechnology with Wolbachia in Handling Dengue Fever. The method of implementing the community service with a pre-test, then the presentation of material on "Education of Aedes Biotechnology with Wolbachia in Handling Dengue Fever: Health Law Study" is carried out offline, with lecture methods, demonstrations, and Q&A discussions. At the end of the material presentation session, a demonstration of making anti-mosquito spray products will be held and ended with a question andanswer session and post-test. The results of the Community Service show that there is a significant difference in the amount of income, the amount of pretest scores before receiving material exposure and the posttest scores after receiving the material.